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October 1, 2016

Search: Calculate the pH of a 0.21 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5.

Number of results: 61,018

chemistry
A sample of water is known to contain 1.51 10^24 H2O molecules. How many moles of H2O molecules are present in the sample?
March 22, 2016 by Dave

statistics
The selling of prices Of six second hand bicycles in relation to their ages were noted for advertisements appearing in a local newspaper . The details are given in the table bellow. Age x ( years) 4 10 2 1 3 4 Price, y. 9 1 14 18 12 7 ( a) calculate the value of the product - ...
August 23, 2014 by blessed

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 ...
February 9, 2007 by nickel

chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid).
November 3, 2014 by eddie

chemistry
Hey, I am having a real hard time getting the answers to the problems. Any help would be greatly aprreciated! 1. When 11 mL of a solution containing 2.9 M AlBr3 is diluted to 33 mL, a dilute solution is formed. What is the Br- concentration in 25 mL of the dilute solution? 2. ...
November 7, 2007 by chelsea

Science
C6H5NH2 + H2O C6H5NH3+ + OH- 1. Aniline, a weak base, reacts with water according to the rxn above. a. A sample of aniline is dissolved in water to produce 25.0 ml of a .10 M soln. The pH of soln is 8.82. What is Kb for this rxn? b. The soln in part b, is titrated with...
April 12, 2008 by Francis

Science
Help!! How many atoms in 3.45 mL of water? (H2O only;mL=g) and If you are out panning for gold and discover a nugget that is exactly 2.50 moles, how many molecules, atoms, and grams would you have? At a cost of $375 per ounce, what would be the value of gold?
October 20, 2010 by Jack

Chem
4 NH3 + 3 O2 --> 2 N2 + 6 H2O a.) Assume 3.0 mol O2 completely reacts. Calculate the moles required for the other reactant. Calculate the moles that can be produced for each product. b.) Assume 8.0 mol NH3 completely reacts. Calculate the moles required for the other ...
February 13, 2016 by Deni

Chemistry
How many liters of gasesous methane (CH4) must be burned in oxygen to produce enough H2O and CO2 to fill a 3.0 L balloon? Assume that H2O and CO2 are the only combustion products and that the temperature and pressure remain constant. How would I solve this? Attempt: 3.OL (1 ...
August 29, 2010 by Amy~

Chemistry
This is a longer assignment. I want you to confirm my first two answers and help me figure out the last. 3 Cu (s) + 8 HNO3 (aq) → 3 Cu(NO3)2 (aq) + 2 NO (g) + 4 H2O (l) A copper penny with a mass of 3.067 g is dissolved in 100.0 ml of 1.000 M nitric acid. A. How many ...
January 6, 2015 by Morgan

SAT Math
Can I please get some help on these questions: 1. If , find the value of 2 square root of 17-x = 2x-10, find the value of x/4. 2. If absolute value of 3x+6 < 9, then which of the following is a possible value of x ? My answer choices are -7, 1, -5, -1, 10. When I solve for ...
June 1, 2013 by mysterychicken

maths
the value of a car depreciate by 13% of it value in the first year. in the subsequent year the depreciation is 8% of its value at the beginning of the year.the value of the car when new is $45000. find its value when it is four years old.
February 21, 2016 by fernando

chemistry
For the equilibrium H2(g)+CO2(g)<-->H2O(g)+CO(g) Kc=3.18 at 1106 K.If each of the four species was initially present at a concentration of 3.000M,Calculate the equilibrium concentration of the CO (g) at this temperature. Choices 0.844 3.268 3.844 3.460 2.156 Thanks ...
May 9, 2010 by Andy

Chemistry
The combustion reaction for benzoic acid C6H5CO2H(s) + 15 2 O2(g) → 7 CO2(g) + 3 H2O(ℓ) has ∆H0 = −3226.7 kJ/mole. Use Hesss Law to calculate ∆H0 f for benzoic acid.
October 7, 2012 by Austin

mixture problems
A chemist has two solutions of sulfuric acid. One is a 25% solution, and the other is a 50% solution. How many liters of each does the chemist mix to get 10 liters of a 40% solution? 25% solution L: 50% solution L:
November 21, 2014 by Kendall

Chem
Using the standardized NaOH solution, the student weighs out 0.2550g of a solid unknown acid and finds that 28.50mL of the NaOH solution is required to reach an end point with the acid. Calculate the molar mass of the unknown acid, assuming the acid is diprotic.
April 25, 2014 by Jen

Chem
Using the standardized NaOH solution, the student weighs out 0.2550g of a solid unknown acid and finds that 28.50mL of the NaOH solution is required to reach an end point with the acid. Calculate the molar mass of the unknown acid, assuming the acid is diprotic.
April 25, 2014 by Jen

Chemistry help
I am confused as to how to solve the below problem. I am not sure which formula to use. At first I thought I calculate the molar mass of NaOH, followed by calculating moles of NaOH. But I don't have the mass of NaOH to calculate moles. Do I convert 10mL to grams to Be able to ...
March 15, 2012 by Julie

chem
An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to form carbon dioxide and 47 grams of water. How much carbon dioxide is formed? do I use the heat capacity equation? How much oxyen is used to produce 47...
February 14, 2007 by tina

Chemistry
Can someone confirm that I'd be doing this right? If an 0.520 m aqueous solution freezes at -3.00 C, what is the van't Hoff factor, i, of the solute? It says I can find the Kf values on a table. I had no idea which Kf value to use... so i just used water... is that right? If ...
February 16, 2012 by David

Chemistry
To calculate the percent error you would use the error in measurement divided by accepted value times 100 correct? So for an experiment in which you had to find the concentration of a dye in a powdered drink solution, to find the percent error would you use the number you ...
October 12, 2011 by Hannah

chem 1151
a 250.0 mL of solution contains 50.0 mL acetone and 45.0 mL ethyl alcohol and the remainder water. Calculate the % acetone, % ethyl alcohol, and water in the solution. Show calculations.
June 14, 2011 by ris

Chemistry
A solution is made by dissolving 26.7 g urea, a nonelectrolyte, in 301 g water. (The vapor pressure of pure water is 23.8 torr at 25C and 71.9 torr at 45C.) Calculate the vapor pressure of this solution at 25C.
May 6, 2015 by Jack

Chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid) *Please explain it in detail, dont leave a step out! Thank You!
November 3, 2014 by Joseph

Chemistry
(a) Explain what is meant by a weak acid. Methanoic acid (HCO2H) has a numerical value of Ka(T) at 298K of 1.60 10-4 (b) Write an expression for Ka(T) of methanoic acid, and state its units. (c) What is the pH value of a 0.10 mol dm-3 aqueous solution of methanoic acid? Give...
April 22, 2012 by Henry

Chemistry II
Acetone, C3H6O, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone(d=0.790g/mL) to 50.0mL of ethyl alcohol,C2H6O(d=0.798 g/mL). Assume that the volumes are additive. From this information calculate the molarity of acetone in the ...
September 27, 2009 by Mandy

accounting
On December 31, 2008, University Theatres issued $500,000 face value of bonds. The stated rate is 6 percent, and interest is paid semiannually on June 30 and December 31. The bonds mature in 10 years. Required: If required, round your answers to the nearest whole dollar. ...
July 20, 2011 by me

Chemistry- please check my work
Question: The following equilibrium was studied by analyzing the equilibrium mixture for the amount of HCL produced. LaCl3(s)+ H2O(g) goes to LaOCl(s)+2HCl(g). A vessel whose volume was 1.25L was filled with 0.0125 mol of lanthanum (III)chloride and 0.0250 mol H2O. After the ...
February 25, 2009 by eliz

math
y′=(2y+x)/x, y(1)=4 1. The resulting differential equation in x and u can be written as xu'=------ 2.Separating variables we arrive at -----du= dx/x 3.Integrating both sides and simplifying, the solution can be written in the form u+1=Cf(x) where C is an arbitrary ...
February 29, 2016 by Leahv

chemistry
A student prepares a solution of hydrochloric acid that is approximately 0.1 M and wanted to determine its precise concentration. A 25.00 mL portion of the HCl solution is transferred to a flask, and after a few drops of indicator are added, the HCl solution is titrated with 0...
June 14, 2015 by walter

Macro Help
Calculating Marginal Propensity to Save and Marginal Propensity to Consume Consider the following table. For this hypothetical economy, the marginal propensity to save is constant at all levels of real GDP, and investment spending is autonomous. There is no government. Real ...
May 12, 2008 by animal

chemistry
Calculate the pH of a solution (to 2 decimal places) which is 0.106 M in phenol, Ka = 1.0 x 10-10.
January 10, 2008 by caleb

Chemistry II
Calculate the freezing point of a 0.75 m solution of Al2(CO3)3.
September 16, 2009 by Chase

Chemistry
How to calculate the density and viscosity of a 10 % by wt salicyclic cid solution.
February 15, 2010 by arp

Chemisty
calculate pH of 50.0 mL of a .100 M solution of the weak monoprotic acid HX
March 29, 2010 by Emily

chemistry
How would you calculate the concentration of an aqueous solution of Ca(OH2)that has a pH of 12.57.
April 14, 2010 by kia

chemistry
Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaC2H3O2?
May 6, 2010 by Julie

chemistry
Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaOH?
May 6, 2010 by Julie

chemistry
The density of 3M solution of NaCl is 1.25 g/mL. Calculate the molality of the soution.
May 10, 2010 by varsha

chemistry
Calculate the pH of the solution made by dissolving 8.00 g of lactic acid.
June 22, 2010 by Jay

chemistry
The pH of a solution is measured to be 5.4. Calculate the following: a) [H3O^+] b)pOH c)[OH^-]
June 28, 2010 by Jay

chemistry
Calculate pH of 0.02 mol/L Ba(OH)2 solution. (Assume 100% dissociation).
October 20, 2010 by Helen

COLLEGE CHEMISTRY
Calculate the pH of a 0.052 NH4Cl aqueous solution
November 9, 2010 by shanice

chemistry
calculate the pH of a 1.94M solution of nitrous acid (HNO2 - ka = 4.5E-4).
December 15, 2010 by Tara

Chemistry help plz
How to calculate the hydronuim ion cencentration of solution with a pH of 2.5?
December 23, 2010 by Tarkan

chemistry
A solution formed by dissolving an antacid tablet has a pH of 9.18. Calculate [H+].
January 20, 2011 by jaycab

Chemistry
Calculate the pH of a 0.250M solution of Sulfurous acid, H2SO3.
February 18, 2011 by Josh

chemistry
Calculate .200 mol sodium phosphate in 10.0 ml of solution
March 4, 2011 by Anonymous

chemistry
Calculate the molarity of each of the following solutions. 1. 61.9 g of C2H6O in 3.4 L of solution
March 9, 2011 by Abby

Chemistry
Calculate the concentrations of H3O+ and OH- ions in a 0.25 M HClO4 solution.
March 10, 2011 by John

chemistry
Calculate the pH after 0.15 mol of NaOH is added to 1.00 L of the solution that is 0.50 M HF and 1.01 M KF
March 25, 2011 by kyle

chemistry
20 g of sugar are dissolved in 1 L of water. Calculate the concentration of this solution.
August 28, 2011 by Sarah

chemistry
Calculate the osmotic pressure of a 6.0 10-2 M solution of NaCl at 20C (293 K).
October 29, 2011 by Chemistry Chick

Chemistry
A solution is prepared by diluting concentration HNO3 to 2.0 M,Calculate PH.
November 23, 2011 by Ethio

chemistry
Calculate the pH of a solution obtained by mixing 30 mL of 0.75 M CH3COOH with 15 mL of 1.5 M NaOH.
January 24, 2012 by grewal

chemistry
Calculate the molarity of 2.05 L of a solution containing 1.51 g of dissolved KBr
February 9, 2012 by jessica

AP CHEMISTRY
If a solution of HF (Ka = 6.8 10-4) has a pH of 3.42, calculate the total concentration of hydrofluoric acid.
February 14, 2012 by Stanley3000

AP CHEMISTRY
If a solution of HF (Ka = 6.8*10-4) has a pH of 3.42, calculate the total concentration of hydrofluoric acid.
February 16, 2012 by MARY

Chemistry
5.70 g of NH4Cl is added to 13.3 g of water. Calculate the molality of the solution.
February 16, 2012 by Heather

chemistry
Calculate the pH of a 0.87 M NaCN solution. Solve it exactly (no assume x=0.1)
March 20, 2012 by Justin

Chemistry
Calculate the concentration of the hydronium ion([H3Ol+]) for a solution with the pH = 4.5
March 25, 2012 by Lisa

Chemistry
Calculate the concentration of all species in a 0.240 solution.
March 27, 2012 by Anonymous

chemistry
a 0,25M solution of a week acid is 3% dissociated.calculate ka
April 4, 2012 by racha

chemistry
Calculate the pH of an Aqueous 3.8 x 10^-5 M solution of barium hydroxide. I need help.
August 21, 2012 by Vincent

chemistry
Calculate the molality of CsCl in a 19% by mass aqueous solution.
September 13, 2012 by cheri

Science
calculate the solubility of NaCl in a solution which contains 0.1 M CaCl2
October 12, 2012 by Tejpal Chandrakar

chemistry
0.30M nh3 and 0.20M HCL calculate the ph of solution kb=1.8 10^-5
March 2, 2013 by kanks

general chemistry
Calculate the molarity of each of the following solutions.70.8 in 2.51 of solution
March 7, 2013 by kelia

Chemistry
Calculate the pH of a buffer solution that contains 0.60 M NaH2PO4, and 0.26 M Na2HPO4.
April 14, 2013 by Maddie

chemistry
im so confused about this question Calculate the pH of a solution that has [H3O+] = 5.5 x 10-3.
April 29, 2013 by joe

chemistry
calculate the molarity of 29.25 grams of NaCl in 2.0 liters of solution
May 28, 2013 by Anonymous

Chemistry
Calculate the permanganate activity in an aqueous 0.18 M KMnO4 solution.
August 12, 2013 by RC

Chemistry
3.50 g of NH4Cl is added to 18.8 g of water. Calculate the molality of the solution.
October 16, 2013 by Shardai

chemistry
8.90 g of NH4Cl is added to 19.7 g of water. Calculate the molality of the solution
November 7, 2013 by Anonymous

ap chemistry
Calculate the ratio of [NH3]/[NH4+] that gives a solution of pH = 10.60.
February 4, 2014 by gabriella

Ap chem-Bases
Calculate the pH of a 0.2M solution of Triethylamine, (C2H5)3N, with a Kb of 4.0x10^-4
February 16, 2014 by Jessica

Ap chem-Bases
Calculate the pH of a 0.2M solution of Triethylamine, (C2H5)3N, with a Kb of 4.0x10^-4
February 17, 2014 by Jessica

Chemistry
A solution formed by dissolving an antacid tablet has a pH of 9.18. Calculate [H+].
April 27, 2014 by Anonymous

Chemistry
A solution formed by dissolving an antacid tablet has a pH of 9.18. Calculate [H+].
April 27, 2014 by Anonymous

Chemistry
Calculate the molar solubility of manganese II hydroxide in ph 12.85 solution.
May 26, 2014 by Anonymous

Science
Calculate the hydroxide ion of a solution of almond extracted of PH 3.8
June 6, 2014 by Debora

Chemistry
Calculate the pH of a 1.19M sodium formate, HCOONa, solution.
November 23, 2014 by Bill

Chemistry 120
Calculate the pH of aqueous solution 0.0000019 M KOH
December 15, 2014 by David Allen

Chemistry
Calculate the pH and concentration of H3O of a 0.285M HCl solution.
January 22, 2015 by Kat

Chemistry
Calculate the pH of a solution that is 0.185M in HC2H3O2 and 0.125M in KC2H3O2
March 6, 2015 by Gabby

Chemistry
Calculate pH of a solution that is 0.255M in CH3NH2 and 0.105M in CH3NH3Br
March 6, 2015 by Gabby

science
Calculate the PH of the 0.4g of NaoH in water to give 200ml of solution
December 15, 2015 by praful

chemistry 12u
how do i calculate this.. a solution of nitrous acid has a pH of 2.73 what is the [H3O+] ?
May 10, 2016 by julie

chrmistry
calculate the molar concentration of 1ppm solution of NaCl?
June 12, 2016 by Anonymous

Science
Calculate the volume of solute percent in 90ml solution with 5%
June 26, 2016 by Althea Jane Duran

chemistry
Calculate the pH of a solution containing 10 g / L of NH4Cl (Kb NH3 = 1.8x10-5
July 5, 2016 by Anonymous

science
Calculate the pH of the solution 5ml of M/5,HCl+10ml of M/10 NaO
August 12, 2016 by KANNAN

CHEM
A 0.552 g sample of ascorbic acid(Vitamin C) was dissolved in water to a total volume of 20.0 ml and titrated with 0.1103 M KOH. The equivalence point occurred at 28.42 ml. The pH of the solution at 10.0 ml of added base was 3.72. From this data, determine the molar mass and ...
March 21, 2012 by Cooper

Chemistry
1.) Watch the animation, and observe the titration process using a standard 0.100 M sodium hydroxide solution to titrate 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding acid-base titrations are correct Drag items A-F to: ...
November 19, 2015 by LuigiR

chemistry
How to find moles given oxidation numbers and chemical formula? Trying to do my chemistry lab but i'm super duper stuck. please help me i'm gonna die. this is the part i'm stuck on: The overall charge on the complex, [Ni(en)(H2O)]^2+ * SO4^2- * H2O is zero; the charge on ...
November 15, 2012 by dr bob's number one fan

chemistry
Calculate the enthalpy of change, Delta H of rxn, for each of the reactions. record the values in the data table part 2 I calculated the heat of rxn of the HCl +NaOH------NaCl + H2O. How do i go from here to enthalpy of change
January 8, 2012 by AP Chemistry Question

Chemistry
Calculate the mass of baking soda, NaHCO3, needed to neutralize 3.0 mL of 3.0 M hydrochloric acid, HCl(aq). Ok, so I'm super confused. I have the equation, but I'm stuck with what to do with it. Equation: NaHCO3 + HCL --> NaCl + H2O + CO2
February 27, 2013 by Sarah

Chemistry
When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield.
June 10, 2013 by Shane

Chemistry
When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield.
June 10, 2013 by Shane

chemistry
calculate the concentration of each solutions: 3 moles of solute dissolved in 2 liter of solution 6 moles of solute dissolved on 9 liters of solution 4 moles of solute dissolved in 3 liters of solution
March 29, 2010 by jess

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