Monday
April 21, 2014

Search: is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase

Number of results: 26,964

Chemistry. PLEASE HELP
a) To make an acid solution, 6.8 x 10-3 mole of a strong acid (6.8 x 10-3 mole H3O+) is dissolved in water to give a 550 mL solution. What is the pH and [OH-] of the solution? b) 150 mL of water is added to 50 mL of the solution produced in question 3. Calculate the new pH of ...
Thursday, October 17, 2013 at 9:37am by Anonymous

chemistry
It's just plug and chug. mL x M = mL x M mL x 16M = 5,000 mL x 0.1 M Solve for mL HNO3.
Sunday, February 13, 2011 at 9:13am by DrBob222

chemistry
Use mL x M = mL x M 20 mL x 13M = mL x 0.560 mL will be the final volume needed.
Friday, April 22, 2011 at 7:42pm by DrBob222

biochemistry
0.565 mL/g x 8.0g = ? mL. 35 mL + ?ml = ? mL total volume. Check my thinking.
Thursday, August 30, 2012 at 1:53pm by DrBob222

Chemistry
a) To make an acid solution, 6.8 x 10-3 mole of a strong acid (6.8 x 10-3 mole H3O+) is dissolved in water to give a 550 mL solution. What is the pH and [OH-] of the solution? b) 150 mL of water is added to 50 mL of the solution produced in question 3. Calculate the new pH of ...
Thursday, October 17, 2013 at 2:02am by Anonymous

Chemistry
First determine where the equivalence point is so you will know where you are on the titration curve with each of thes additions. mL x M = mL x M 25.0 x 0.05 = mL x 0.063 mL = about 19 or so. Therefore, 10 mL will be before the e.p. and you will have some base and some of its ...
Sunday, November 11, 2012 at 6:29am by DrBob222

statistics
Multiply each proportion by 200: A = 200 * .20 = ? B = 200 * .30 = ? C = 200 * .30 = ? D = 200 * .10 = ? E = 200 * .10 = ? I'll let you finish the calculations.
Friday, April 20, 2012 at 11:05pm by MathGuru

Chemistry(Answer check)
A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.) 0.1052g*63.546/6.022e23 did I set it up right?
Friday, June 21, 2013 at 1:22pm by Ashley

AP Chemistry
50.0 mL of an HCl solution with a pH of 3.5 neutralizes 200.0 mL of a Ca(OH)2 solution. What is the molarity of the Ca(OH)2 solution?
Thursday, January 30, 2014 at 6:42pm by Gabriella

Chemistry
A student has 100.0 mL of an unknown solution of Vitamin C. She removes 1.00 mL of this solution, dilutes it to 50.0 mL, and titrates this second solution with an iodine solution that is 8.5 10-4 M. 6.60 mL of iodine solution is required to reach the endpoint. 1. How many ...
Monday, March 12, 2012 at 9:06pm by Shelley

Chemistry
Concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of 1:200 hcl solution. My calculation 1.18g/ml x 1000ml x 0.38/36.46 = 12.3M 12.3M = 500ml x 1:200...
Sunday, August 19, 2012 at 12:26pm by Fai

Math
Why don't you use the conversions I told you: 1 liters = 1000 milliliters so 4,200 milliliters = 4.2 liters (0.2 liters = 200 mL)
Thursday, March 4, 2010 at 7:02pm by Casey

chem lab
Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Indicate if the volume of NaOH is before or after the equivalence point. i dont know where to start.
Tuesday, May 10, 2011 at 2:00am by Anonymous

Chemistry
Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Given: Molarity of all chemicals are 0.1 M HCl and HC2H3O2 are 8ml prepared in 100ml water.
Thursday, May 10, 2012 at 5:48pm by Raskin

chemistry
What is the pH of the solution created by combining 2.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL of NaOH pH w/HCl pH w/HC2H3O2 2.80 ? ? okay, so i tried m1v1=m2v2 and when i got m2 i would input it in -log(H+) to...
Wednesday, July 9, 2008 at 12:19am by UN

chemistry college
Consider the titration of 30.0 mL sample of 0.050 M NH3 with 0.025 M HCl. Calculate the pH after the following volumes of titrant (acid)have been added: a)0 mL, b)20.0mL, c)60.0mL, d)65mL Kb for NH3 is 1.8 x 10^-5
Wednesday, December 4, 2013 at 5:33pm by Taylor M

chemistry
The idea here is that an excess of HBr was added to Ba(OH)2. Some reacted with Ba(OH)2 and some was left over. How much was left over? That amount is what was titrated with the NaOH. Ba(OH)2 + 2HBr ==> 2H2O + BaBr2 +(xs HBr) mmoles HBr initially = 400.0 x 0.5000M = 200.0 ...
Saturday, February 26, 2011 at 2:38pm by DrBob222

Chemistry
Is that 10 mL of the 0.2M H3PO4 added to 250 mL H2O to make 260 mL solution? If you titrate the entire solution, which seems unlikely, then you will have H3PO4 ==> NaH2PO4 + H2O mols H3PO4 = 0.010L x 0.2M = 0.002 mols NaOH required = 0.002 since 1 mol H3PO4 = 1 mol NaOH. ...
Saturday, February 8, 2014 at 2:03pm by DrBob222

DrBob222 : need help with the problem
An unknown compound, X, is though to have a carboxyl group with a pKa of 2.0 and another ionizable group with a pKa between 5 and 8. When 75 mL of 0.1M NaOH is added to 100 mL of a 0.1M solution of X at pH 2.0, the pH increases to 6.72. Calculate the pKa of the second ...
Tuesday, September 11, 2012 at 12:55am by ron

Chemistry
Calculate the molarity of the concd HCl. 1.20 g/mL x 1000 mL x 0.37 x (1/36.5) = about 12 M or so but you do it exactly. Then mL x M = mL x M mL x 12 M = 2800 mL x 0.475 Solve for mL of the concd HCl solution.
Thursday, February 21, 2013 at 8:26pm by DrBob222

Chem
When 100mL of 0.60mol per liter K3BO3 is added to 200 mL of 0.40 mol per liter Ca3(BO3)2 Find a)moles of K3BO b) moles of Ca(BO3)2 c)final concentration of K+ d)final concentration of Ca+2 e) final concentration of BO3 negative 3
Wednesday, March 19, 2014 at 12:43am by BILL

Chem
The easiest way is to work up an ICE chart as below. I like to work in millimoles. For the original buffer, if we have 1L of the original buffer, we will have the following millimoles of HNO2 and NaNO2. mmoles HNO2 = 0.06M x 1000 mL = 60 mmoles NaNO2 = 0.160M x 1000 mL = 160 ...
Saturday, May 14, 2011 at 10:40am by DrBob222

chemistry
The solution you want contains 750 x 0.327 mmoles of NaCl if the volume you add is x ml then the number of mmoles added is 9.54x mmoles = 750 x 0.327 mmoles hence find x the final volume is x+y=750 ml, where y is the volume of water added. Two points.... 9.54M NaCl would ...
Wednesday, November 17, 2010 at 12:44am by Dr Russ

Chemistry
What is the (H30) concentration when 40 mL of 0.10 M nitrous acis, HNO2, are added to 10.0 mL of 0.10 M HCl? Ka for HNO2 is 4.0 x 10^-4. I get 1 x 10^-3. Is this right?
Wednesday, May 5, 2010 at 9:53pm by Mary

Chemistry
165 mL x 0.360M = about 59.4 millimols base and 59.4 mmols acid. ..........base + HCl ==> acid I........59.4.....0......59.4 add...............x............... C........-x.....-x........+x E.......59.4-x....0......59.4+x pH = pKa + log (base)/(acid) Look up the pKa for ...
Sunday, November 17, 2013 at 7:47pm by DrBob222

math
total = x (2/5)x + (1/4)x + (3/10)x + 10 = x times 20 8x + 5x + 6x + 200 = 20x 200 = x x = 200 check: (2/5)200 = 80 red (1/4)200 = 50 brown 3/10(200) = 60 green 10 yellow 80+50+60+10=200
Wednesday, September 21, 2011 at 6:59pm by Reiny

11th grade
200 ml of a gas at 27oC and 1140 Pa pressure is transferred to a vessel of 450 ml capacity. What temperature is to be applied, if the pressure applied is 2000 Pa?
Friday, March 19, 2010 at 12:44am by Silva

11th grade
200 ml of a gas at 27oC and 1140 Pa pressure is transferred to a vessel of 450 ml capacity. What temperature is to be applied, if the pressure applied is 2000 Pa?
Friday, March 19, 2010 at 12:45am by Silva

high school chem
if 150 ml of HNO3 of unknown conceration withmethyl orange indicator present is tritrated with [0.163M]KOH, then the red solution turns yellow after 28.9 ml of the KOH is added. what is the molarity of HNO3 solution.
Tuesday, June 1, 2010 at 7:28am by jessica

chemistry
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
Wednesday, April 11, 2012 at 6:23pm by bill

Science/Chemistry
Zn(OH)2 solid (molecular mass = 99.41 amu) is added to 0.500 L of 0.50 M HBr. The resultant solution which is acidic, requires 185 mL of 0.500 M NaOH for neutralization. Calculate the mass (in mg) of Zn(OH)2 that was originally added (problem 53 in Purdue test bank)
Sunday, September 28, 2008 at 4:42pm by Kelsey

Chemistry
You have a solution that contains 5.0 grams of oxalic acid dissolved in 150 mL of water. This solution is placed in a seqparatory funnel, and the 100 mL of diethyl ether is added to the separatory funnel and an extraction is performed. Use the following constants to calculate ...
Tuesday, October 11, 2011 at 12:00am by BOB

chemistry
A 0.5130 g aspirin tablet which was dissolved in 95 percent ethanol required 27.98 mL of 0.1000 M NaOH for neutralization. Then an additional 42.78 mL of 0.1000 M NaOH was added and the soln was heated to hydrolyze the aceytlsalicyclic acid. After the reaction mixture was ...
Wednesday, January 12, 2011 at 2:26pm by kelis

thermochem
An unknown volume of water at 18.2C is added to 27.0 mL of water at 36.7C. If the final temperature is 23.5C, what was the unknown volume? (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL.)
Sunday, October 5, 2008 at 1:03pm by james

chemistry
A sample of carboxylic acid is added to 50.0 mL of 2.27 M NaOH and the excess NaOH required 28.7 mL of 1.86 M HCl for neutralization. How many moles of NaOH reacted with the carboxylic acid?
Thursday, November 11, 2010 at 5:43pm by Ali

chemistry
I think your units are messed up. PV = nRT It's easier to use atmospheres than kPa. R is 0.08205 L*atm/mol*K when atm is used for pressure, P. V must be in liters. I don't know what grams is doing in PV = nRT P = 750 torr/760 = ?? atm V = 200 mL = 0.200 L n = solve for this R...
Sunday, November 4, 2007 at 3:47pm by DrBob222

AP Chemistry
Will a precipitate form when 100.0 mL of a 7.5 10-4 M Mg(NO3)2 is added to 100.0 mL of 5.8 10-4 M NaOH? (Hint: Ksp for Mg(OH)2 = 8.9 10-12) Give the value of Q, to support your answer.
Sunday, December 4, 2011 at 7:43pm by Bill

CHEMISTRY
4.) A solution is prepared by dissolving 25.0 g of aluminum sulfate in enough water to make 125.0 mL of stock solution. A 10.0 mL aliquot (portion) of this stock solution is then removed and added to 15.0 mL of water. Calculate the concentrations of all ions in the final ...
Friday, October 25, 2013 at 5:48pm by DrBob222

chem
#drops x (grams/drop) = grams. You know # drops. You know grams. Calculate grams/drop and take the reciprocal. Since mass = volume x density you can calculate the volume of the 120 drops. Then if 120 drops = xx mL, how many drops per 1 mL. You must remember that the number of ...
Wednesday, October 7, 2009 at 2:21pm by DrBob222

chemistry
When 25.0 mL of 1.0 M H2SO4 is added to 50.0 mL of 1.0 M NaOH at 25.0 C in a calorimeter, the temperature of the aqueous solution increases to 33.9 C. Assuming the specific heat of the solution is 4.18 J/(gC), that its density is 1.00 g/mL, and that the calorimeter itself ...
Thursday, March 14, 2013 at 7:57pm by nobody

grade 10 chemistry
200 mL/hr x (1 L/1000 mL) x (1 kL/1000 L) x (24 hr/day) x (365 day/yr) = ? Check this.
Wednesday, February 29, 2012 at 7:54pm by DrBob222

Pharmacy Math
Calculate amount of IV fluid to be added to the volume control chamber. Ordered:D5W at 30 mL/hr for continuous infusion with medication x 60 mg every 6 hours to be infused over 20 minutes by volume control set On hand:Medication x 60 mg/2 ml The book says 8 mL but I'm getting ...
Tuesday, April 30, 2013 at 10:17pm by Sherri

Chemistry
I took 25 mL of an unknown weak acid and added it to 10 mL of NaOH solution. I measured the pH and got 2.88 with concentration of NaOH @ .0098 and weak acid at 0.0102. What is pKa for the acid?
Saturday, May 5, 2012 at 9:54pm by tc

Chemistry
It will be less than 200 mL.
Saturday, September 3, 2011 at 12:08pm by DrBob222

Chemistry
1.What mass of NaOH(s) must be added to 300 mL of HCl 0.25 M in order to completely neutralize this acid? 2.During a lab, you mix 2 solutions: a 100 ml solution containing 0.40 g of NaOH and a 100 mL solution containing 0.73 g of HCl. What is the concentration of H+ ions in ...
Thursday, May 9, 2013 at 2:22pm by Talulla

General Chemistry I
A sample of gas occupies a volume of 59.9 mL. As it expands, it does 126.2 J of work on its surroundings at a constant pressure of 798 torr. What is the final volume of the gas? a. 61.1 mL b. 1,250 mL c. 218 mL d. 1,490 mL e. None of the above I used the work function w = -P&#...
Monday, December 3, 2012 at 11:53pm by Emily

Chemistry
If 27.5 mL of 5.7 multiplied by 10-2 M HNO3 is added to 20.0 mL of 2.2 multiplied by 10-2 M HNO3, what is the pH of the solution?
Monday, April 5, 2010 at 3:00pm by Jenny

Organic Chemistry
First you add units. Is that 0.200 M or some other unit? Second, you must know if this is a 1:1 reaction or not. If M and if 1:1 acid/ base ratios, then mL acid x M acid = mL base x M base.
Monday, April 30, 2012 at 11:16pm by DrBob222

Chemistry
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).
Thursday, December 5, 2013 at 12:26pm by Mandy

math
In a rectangle, the parallel sides are equal. Thus, x = width 5x/3 = lenght 2x + 2(5x/3) = 200 6x/3 + 10x/3 = 200 16x/3 = 200 x=37.5 Now, you have the short side. To find the long one, multiply by ratio: 37.5 * 5/3 = 62.5 Control: 2*37.5 + 2*62.5 = 200 200 = 200
Monday, March 26, 2012 at 5:52pm by A.P.

Chemistry
In a certain experiment a sample of Helium in a vacuum system was compressed at 25 degrees C from a volume of 200.0 mL to a volume of 0.240 mL where its pressure was found to be 30.0 mm Hg. What was the orginal pressure of the Helium?
Thursday, February 14, 2008 at 12:56am by britt

Chemistry
Consider the following equilibrium reaction: NaHCO3(s) Na2CO3(s) + H2O(g) + CO2(g) When 100 g of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200C, and the system comes to equilibrium. What happens to the partial pressure of carbon...
Monday, February 27, 2012 at 9:13pm by Tanner

chemisty
I have data for titration of a strong base against a strong acid when I added volumes of NaOH 1 mL at a time to 50.00 mL of HCl to see the change in pH. One of the questions says to find the molarity of the HCl solution but how do I do this with the data.
Monday, February 6, 2012 at 3:31pm by marla

Chemistry
Calculate the pH of a 25 mL sample of distilled water after the addition of 1 mL, 2 mL, 3 mL, 4 mL, and 5 mL of NaOH and HCL. (0.1 M HCl and NaOH) In total, you need to show 10 calculations.
Monday, March 14, 2011 at 9:32pm by Mariah

college chem
Calculate the pH of a 25 mL sample of distilled water after the addition of 1 mL, 2 mL, 3 mL, 4 mL, and 5 mL of NaOH and HCL. (0.1 M HCl and NaOH) In total, you need to show 10 calculations.
Monday, March 14, 2011 at 9:50pm by Mariah

chem urgent!!
What is the pH of the solution created by combining 12.00 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? i need to find the ph with HCL and then with hc2h3o2. i got 1.30 as my anser but this was wrong i multipled all these...
Wednesday, August 20, 2008 at 7:57pm by tom

math115
There are 42 milliliters (mL) of acid in 200 mL of a solution of acid and water. What percent of the solution is acid?
Sunday, March 28, 2010 at 8:56pm by Bstone

CHEMISTRY
Strong base is dissolved in 675 ml of 0.200 m weak acid (ka=3.25x10^-5) to make a buffer with a ph of 3.95. Assume that the volume remains constant when the base is added. HA + OH ---> H2O + A^- calculate the pka value of the acid and determine the number of moles of acid ...
Thursday, November 10, 2011 at 4:57pm by Alexander

Chemistry
it would be exactly 200.0 mL
Saturday, September 3, 2011 at 12:08pm by Mica

math
200 milligrams equals how many ml
Friday, December 28, 2012 at 1:58am by rachel

CHEMISTRY
First determine pKa. pH = pKa + log(A^-)/(HA) I have approximately 3 but you need to be more accurate than that. 650 mL x 0.271M = about 170 mmoles 650 mL x 0.150M = about 95 mmoles mmoles LiOH added = 130 x 0.155M = about 20 mmoles. ...........HA + OH^- ==> A^- + H2O ...
Wednesday, September 21, 2011 at 2:48pm by DrBob222

chemistry
Assuming that 1 gram of aspirin dissolves in 450 ml of water at 10C, how much aspirin would be lost in 40 ml of water added to the reaction mixture if the mixture were at 10 C during filtration?
Tuesday, April 20, 2010 at 8:59pm by bobby

Science
If 20.0 mL of 0.42 M acetic acid (CH 3COOH) is added to 10.0 mL of 0.42 M sodium acetate (CH 3COONa) solution, what is the pH of the resulting solution? (K = 1.8 x 10-5)
Monday, December 13, 2010 at 10:31pm by Mik

Chemistry
50.0mL of 0.200M HCl diluted to 100.0 mL and titrated with 0.200M NaOH. what is total volume of solution(L) if volume of NaOH added(mL) are 0.00, 5.00, and 10.0
Friday, March 25, 2011 at 3:27pm by Anonymous

chemistry
1. 30.0 ml of ethyl alcohol(density=0.790g/ml)are added to a graduated cylinder that weighs 44.28 grams. what will be the mass of the graduated cylinder plus the alcohol(in grams)?
Thursday, September 22, 2011 at 7:04pm by ann

Chemistry
80.0 grams of KBr is mixed with sufficient water to prepare 1865 mL of solution. This solution is then mixed with 46.3 mL of 0.425 M KCl solution. 12 mL of this mixture is subsequently added to 61.0 mL of distilled water. Calculate the molarity of K+ ions in the final mixture...
Tuesday, March 1, 2011 at 12:51pm by Christian

Calculating Dilutions
1. 1 ml serum added to 5 ml saline. 1:2 dilution is made. What is the dilution of serum in tube 6? So the serum + saline would make a 1:6 dilution. Multiply that by serial dilution of 1:2 which would give: (1/6) x (1/2) x (1/2) x (1/2) x (1/2) x (1/2) = (1/192). Is that ...
Sunday, February 3, 2013 at 5:22pm by Anonymous

College Chemistry/Lab Math
I think I have this problem figured out correctly, but is there anyone who can tell me if I'm doing something wrong. The question is... "One troy ounce of gold is worth $380. There are 33.8 grams per troy ounce. You have a stock colloidal solution of a very fine gold dust. It'...
Sunday, March 17, 2013 at 1:46pm by James

chemistry
mL x M = mL x M. 1000 mL x 6M = mL x 3M mL = (1000 x 6)/3 = 2000 mL. Therefore, add 1000 mL
Thursday, April 29, 2010 at 7:10am by DrBob222

medicine
You might try some of the following: http://search.yahoo.com/search?fr=mcafee&p=final+concentration+of+a+mixed+solution+with+50ml+of+20%25+solution%2C+150+ml+of+15%25+solution+%26+200+ml+of+a+35%25+solution Sra
Tuesday, July 20, 2010 at 2:15pm by SraJMcGin

chem
Calculate the volume of 0.200 M acetic acid and the volume of 0.100 M sodium acetate required to make 200.0 mL of a buffer solution with pH = 5.00. The Ka for acetic acid at 298 K is 2.00 x 10-5.
Monday, April 4, 2011 at 1:24am by chem

pharma medicine
you are combining 50ml of a 20%sol,150ml of a 15% sol.,and 200ml of a 35% sol.what is the final % concentration of the mixed sol. how many total grams are is the final sol? Grams total= .2*50 + .15*.15 + 200*.35 This is making a big assumption: that the density of the ...
Saturday, December 2, 2006 at 1:34pm by rimple

chemistry
millimoles HNO3 = mL x M = 50.00 x 0.3M = 15 millimoles. mmoles KOH = mL x 0.6M = mL = 0, 0mmoles KOH mL = 15.5, 9.3 mmoles mL = 25.0, 15 mmoles mL = 40.0, 24 mmoles I'll do the 15.5 or 9.3 mmoles KOH added. ..........HNO3 + KOH ==> KNO3 + H2O initial...15......0........0...
Friday, December 2, 2011 at 6:50pm by DrBob222

Chemistry
You have a solution that contains 5.0 grams of oxalic acid dissolved in 150 mL of water. This solution is placed in a separatory funnel, and the 100 mL of diethyl ether is added to the separatory funnel and an extraction is performed. Use the following constants to calculate ...
Tuesday, October 11, 2011 at 12:00am by BOB

Chemistry
a)HCl --> H^+ + Cl^- HCl is 100% ionized; therefore, (HCl) = (H^+) = 0.8M pH = -log(H^+) = ?? b)to start. moles HCl = M x L = 0.800*0.040 = 0.032. moles KOH added in 5 mL = M x L = 0.600*0.005 = 0.003 ................HCl + KOH ==> KCl + H2O initial......0.032....0...
Friday, April 1, 2011 at 1:18pm by DrBob222

Chemistry
A solution is prepared by dissolving 15.6 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.00 mL sample of this stock is added to 52.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution. I know ...
Tuesday, May 4, 2010 at 1:33pm by Anonymous

chemistry...
thanks for the last help, i got the right answer!! i got this wrong... (answer is supposed to be 0.165 but i put 0.0652) A sample of Na2CO3 weighing 0.2863 g is dissolved in 50 mL of water and an endpoint is reached when 32.83 mL of HClO4 has been added. Calculate the molarity...
Friday, November 16, 2007 at 6:55pm by mark

chemistry
A 75.0-\rm mL volume of 0.200 M \rm NH_3 (K_{\rm b}=1.8\times 10^{-5}) is titrated with 0.500 M \rm HNO_3. Calculate the \rm pH after the addition of 13.0 mL of \rm HNO_3.
Sunday, November 28, 2010 at 5:17pm by sam

Chemistry
When 20.0 mL of 0.10 M NaOH are added to 20.0 mL of 0.10 M hypobromous acid, HOBr, what is the hydrogen ion concentration (H^+)? Ka for HOBr is 2 x 10^-9. I get 5 x 10^-4. Is that right?
Thursday, May 6, 2010 at 12:01am by Mary

chemistry
First, decide upon how many mL of the diluted solution you want to make; say 1000 mL, then mL x M = mL x M 1000 mL x 1 M = mL x 17.6 M Solve for mL on the right. So you would take that many mL of the 17.6 M stuff and add water to the mark in a 1 L volumetric flask. Said ...
Monday, February 8, 2010 at 1:13am by DrBob222

Chemistry
You obtained 5.57 because you used 0.26 M. I obtained 5.72 because I used 0.26/2 = 0.13 M. Let's just take some convenient value for the volume of CH3NH2. Let's take 100 mL of 0.26 M. At the equivalence point we will have added 0.1 x 0.26 M = 0.026 moles CH3NH2. If we titrate ...
Saturday, June 5, 2010 at 6:59pm by DrBob222

chemistry
The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required toprepare a 250. mL acidic buffer with pH = 2.75. The inital molarity of hydroflouric acid is .250M but you have only 75mL. Part 2 Recalculate the pH of the buffer prepared in...
Wednesday, April 6, 2011 at 9:48pm by John

chemistry
Which has more alcohol? 200 mL of 3.2 % vol/vol beer or wine with 7% vol/vol alcohol and a volume of 100 mL?
Sunday, July 10, 2011 at 1:37pm by g

Chemistry
a solution is made by combining 10.0 ml of 17.5 M acetic acid with 5.54 g of sodium acetate and diluting to a total volume of 1.50 L. a)calculate the pH of the solution. b) how many grams and milliliters of 14.6 M potassium hydroxide needs to be added so pH=pKa? c)what is the ...
Tuesday, November 29, 2011 at 5:09pm by Amanda

Chemistry
For each electron in a ground-state Be atom, select the set of quantum numbers that represents it. Check all that apply. n=1 l=0 ml=-1 ms= +1/2 n=1 l=0 ml=0 ms=-1/2 n=2 l=1 ml=0 ms= -1/2 n=1 l=0 ml=0 ms=+1/2 n=2 l=1 ml=1 ms=+1/2 n=2 1=0 ml=0 ms=+1/2 n=2 l=0 ml=0 ms=-1/2 n=2 l=...
Sunday, March 24, 2013 at 11:39pm by Anonymous

Chemistry
For each electron in a ground-state Be atom, select the set of quantum numbers that represents it. Check all that apply. n=1 l=0 ml=-1 ms= +1/2 n=1 l=0 ml=0 ms=-1/2 n=2 l=1 ml=0 ms= -1/2 n=1 l=0 ml=0 ms=+1/2 n=2 l=1 ml=1 ms=+1/2 n=2 1=0 ml=0 ms=+1/2 n=2 l=0 ml=0 ms=-1/2 n=2 l=...
Sunday, March 24, 2013 at 11:41pm by Anonymous

Chemistry
Could someone please help me complete my lab experiment. Antacid Brand: Life Concentration of HCl: 0.1845 M Concentration of NaOH: 0.1482 M Trial 1: 1.Mass of Table: 1.2173g 2.Volume of HCl added: 75.0 mL 3.Milliomoles of HCl added:mmoles ? Help 4.Volume of NaOH used: 17.14 mL...
Monday, October 18, 2010 at 8:13pm by Akhed

chemistry
a student was asked to prepare 100.0 mL of 0.0200 M solution of HCL from 0.400 M solution of HCL. in order to do this he measured 5.0 mL of 0.400 M HCL with a graduated cylinder, transfered this amount to a 100 mL beaker, added 95 mL of deionized water measured with a ...
Tuesday, November 12, 2013 at 11:08pm by morgan

Chemistry
Need help with #2 & # 3 1. Record the pairs of data for pressure (atm) and volume (mL). Pressure(atm) Volume(mL) 1.000 150 mL 1.154 130 mL 1.364 110 mL 1.667 90 mL 2. Does your experimental data verify Boyle's Law? Explain. 3. What pressure would the gas sample have at a ...
Friday, May 14, 2010 at 2:22pm by Ashley

Analytical chemistry
A 25.0-mL solution of 0.0660 M EDTA was added to a 33.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0450 M Ga3 solution until all the EDTA reacted, requiring 13...
Thursday, April 4, 2013 at 1:53pm by Ashley

math
let the windspeed be x km/h time going with the wind = 500/(200+x) time going against the wind = 500(200-x) the difference in those times = 1/2 hr 500/(200-x) - 500/(200+x) = 1/2 times 2(200-x)(200+x) 1000(200+x) - 1000(200-x) = (200-x)(200+x) 200000 + 1000x - 2000000 +1000x...
Thursday, February 16, 2012 at 7:51am by Reiny

Chemistry
3.10g/ml *1mole Br/79.0g =0.039 mol/ml 0.039mol/ml * 2.00ml =0.0784 mol 1.05 g/ml * 1mol/60g = 0.0175 mol/ml * 125 ml =2.18 mole I dont know where I am going wrong becaus ethe answers are not same????????
Wednesday, February 10, 2010 at 1:32pm by CC

Chemistry
The question doesn't make sense to me. The 50 mL of the AgNO3 solution has a mass of 50.0 g assuming the density of water and the AgNO3 soln is the same; however, that is the mass before an excess of Zn metal is added. I have no idea how much the total material weighs. It all ...
Wednesday, June 30, 2010 at 4:34pm by DrBob222

Chemistry
In each of the following, determine how much solute (in g or mL) must be added to the correct quantity of water to make the given amount of solution at the correct concentration. a)KI to make 50.0mL of a 0.50 M solutioon b)12.0 M HCL to make 500 mL of a 1.0 M HCl c)Sucrose (...
Sunday, May 2, 2010 at 4:20pm by Kim

Chemistry please help
I can't find the answer of A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.) I calculated 0.1052*63.546/6.022e23/0.2085 but webassign told...
Friday, June 21, 2013 at 2:31pm by Ashley

chemistry
A titration was performed on 50.0 ml of .250 M NaOH. After the addition of 71.4 ml of HCl,the phenolphthalein indicator changed from pink to colorless. What was the concentration of the HCl? im not sure how to figure this one out but here goes 200*.250*1000=50000 1000*121.4=...
Thursday, March 22, 2007 at 12:15pm by unknown

Chemistry
In 50 mL of the buffer you will have millimoles COO- = 50 mL x 0.18322M = 9.160 mmoles HCOOH = 50mL x 0.1522 = 7.610 mmols NaOH added = 10 mL x 0.3657 = 3.657 ...........HCOOH + OH^= ==> HCOO^- + H2O initial....7.610....0........9.160 add................3.657............ ...
Saturday, April 16, 2011 at 9:40pm by DrBob222

chemistry
When 0.752 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 12.2C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do not ...
Saturday, February 10, 2007 at 12:30pm by nickel

chemistry
how many ml of water at 10 degrees celsius must be added to 75 ml of water at 35 degrees celsius to obtain a final temperature of 19 degrees celsius?
Tuesday, January 4, 2011 at 5:22pm by Jennifer

chemistry
I am doing a home lab experiment about acid-base neutralization. I just need a little help to see if I am doing it correctly. I completed the experiment and recorded the data. We were to add 25 ml of vinegar and the 1 ml of cabbage indicator, the add i ml of ammonia at a time ...
Saturday, March 6, 2010 at 7:47am by Lynn

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