Wednesday

November 26, 2014

November 26, 2014

Number of results: 61,338

**A/P Chem**

A student wants to make a 5.00% solution of potassium chloride using .0377 g of the substance.What mass of water will be needed to make the solution?
*July 24, 2011 by Autum*

**AP Chem**

It takes 58 mL of 0.124 M KOH to neutralize 34.5 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in unites of moles/liter.
*September 11, 2011 by Chandler*

**chemistry**

A solution contain 43mEq/L of Cl- and 11 mEq/L of HPO4*2-. If the only cation in the solution is Na+ what is the Na+ concentration if mEq/L? Can you help me with each step to solve this problem?
*October 14, 2011 by Connie*

**Chemistry**

A stock solution is prepared by adding 20mL of 0.2M MgF2 to enough water to make 80mL. What is the F– concentration of 20 mL of the stock solution?
*November 3, 2011 by aDRIAN*

**chemistry**

If 215.0 mL of water are added to a 237 mL sample of a 1.702 M dextrose solution, what is the new molarity of dextrose in the resulting solution?
*December 2, 2011 by B*

**applied chemistry**

A 50.0mL volume of AgNO3, solution contains 0.0285 mol AgNO3 (SILVER NITRATE). What is the molarity of the solution?
*March 7, 2012 by jose*

**finite math**

Determine whether each system of linear equations has a)one and only one solution, b)infinitely many solutions, or c) no solution 2x-4y=5 3x +2y=6
*April 3, 2012 by bob*

**chemisttry**

how many ml of a 1 M NaOH solution do you need to add to a 250 ml flask and bring it to volume with deionized water to make a 0.12 M NaOH solution
*April 23, 2012 by william*

**MATH**

A provider orders 90 ml of a 2.5% mannitol solution. How much of a 25% mannitol solution should be added to water to achieve the appropriate strength?
*July 6, 2012 by Niricoel*

**chemistry**

What volume of a concentrated hcl solution which is 36% by mass and has a density of 1.179 g/ml to make 4.85L of an hcl solution with ph of 1.9? Who helps me to solve it for me.
*August 4, 2012 by Fai*

**Chemistry**

75.0 mL of a 1.80 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 187 mL of water. What is the final concentration?
*August 26, 2012 by Amanda*

**Chemistry**

75.0 mL of a 1.80 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 187 mL of water. What is the final concentration?
*August 26, 2012 by Amanda*

**chemistry**

It takes 62 mL of 0.124 M KOH to neutralize 46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in units of moles/liter
*September 13, 2012 by cheri*

**chemistry**

It takes 62 mL of 0.124 M KOH to neutralize 46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in units of moles/liter
*September 16, 2012 by cheri*

**Chemistry**

67.0 mL of a 1.50 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 163 mL of water. What is the final concentration?
*October 2, 2012 by Anonymous*

**Chemistry 103**

To what volume should you dilute 50ml of a 13M stock HNO3 solution to obtain a 0.131M HNO3 solution?
*October 7, 2012 by YeJi*

**Chemistry**

How many milliliters of a 0.20 M of glucose (C6H12O6) solution are needed to provide a total of 25.0 g. of glucose? Molarity(M)= Moles of Solute/Liters of Solution
*November 11, 2012 by Melia*

**chemistry**

How would student make 500mL of .08500 M solution of iron using stock solution of .3180 M in iron(III)?
*November 27, 2012 by zale*

**chemistry**

If you made up a solution of NaOH by adding 0.010 mole of solid NaOH to 1.0 liter of distilled water, what would be the pH of the solution?
*December 18, 2012 by Monica*

**Chemisty**

74.0 mL of a 1.80 M solution is diluted to a volume of 248 mL. A 124-mL portion of that solution is diluted using 135 mL of water. What is the final concentration?
*January 14, 2013 by Paul*

**chemistry**

anyone help me . .what volume of concentrated HCL solution whoch is 36% by mass and has a density of 1.179 g/ml , should be used to make 4.7 L of hcl solution with a pH of 1.8 ?
*February 13, 2013 by m*

**GEN CHEM**

A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?
*March 3, 2013 by KRIS*

**Chemistry **

the hydronium ion concentration of a 0.050 M solution of a weak acid is 5.9 X 10^-3 M. the acid-dissociation constant is 1.37 X 10^-4 at 25 celsius. what is the pH of this solution? A. 0.077 B. 1.30 C. 2.23 D. 3.86 E. 5.13
*March 18, 2013 by Chemistry*

**chemistry**

A 337-\rm mL sample of unknown \rm HCl solution reacts completely with \rm Na_2CO_3 to form 17.1g \rm CO_2. What was the concentration of the \rm HCl solution?
*April 7, 2013 by Lauren*

**chemistry**

a 35.0ml sample of 37 hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
*May 5, 2013 by john*

**chemistry**

a 35.0ml sample of 37% hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
*May 5, 2013 by john*

**Chemistry**

How much cm3 solution of concentrated ammonia with 25% density of 0.91g/cm3 should be added to 7 g NH4Cl so we can get a solution of 100cm3 with pH 10 (Kb = 1.8 x 10-5)
*June 11, 2013 by HelpPls*

**Chemistry**

Hard ball candy is prepared from boiling an aqueous sugar solution that has a boiling point of 260.°F. What is the molality of this solution?
*September 11, 2013 by Jade*

**Chemistry**

A saturated solution of calcium chromate (CaCrO4) freezes at -0.10 C. What is Ksp for CaCrO4? Assume complete dissociation. The density of the solution is 1.0 g/mL.
*November 12, 2013 by Olivia*

**math**

The equation: T= 2* pi* sqrt(2/3L/9.8) Solve for L. Please show the solution step by step. The square root is giving me trouble in my solution. Thanks for your help.
*January 1, 2014 by alice*

**College Algebra**

Please, I need your help!How much water must be evaporated from 16oz of a 2% salt solution to make a 4% salt solution?
*March 17, 2014 by Cassandra*

**pre algebra**

Check whether (-4, -12) is a solution of the system of equations. y = 6x + 12 2x - y = 4 When the graphs of two equations are parallel, there are infinitely many solutions. y = x + 4 y = 3x solution: ( , )
*April 11, 2014 by berta*

**Chemistry**

A 495-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 18.1g CO2. What was the concentration of the HCl solution?
*May 5, 2014 by Jenn*

**algebra**

A lab assistant wants to make 5 liters of 27.2% acid solution. If solutions of 30% and 16% are in stock, how many liters of each must be mixed to prepare the solution?
*July 5, 2014 by annie*

**Chemistry**

To make 1.5 L of 0.1 M NaCl from a 2.52 M stock solution, you would need to take ____ mL of the stock solution and add _____ mL of water.
*October 1, 2014 by aaa*

**Math check**

Decide whether each equation has one, no solutions, or infanatly many solutions 1.) 2(x - 3) = 2x One solution no solutions many solutions infinatly many solutions 2.) 3(y - 3?) = 2y - 9 + y One solution no solutions many solutions infinatly many solutions 3.)10x - 2 - 6x = 3x...
*January 8, 2014 by Josh*

**chemistry**

A quantity of 12.75 mL of a KOH solution is needed to neutralize 0.5109 g of KHP. What is the concentration (in molarity) of the KOH solution?
*March 3, 2011 by Alex*

**math**

The IV dose of mannitol is 1.5g/kg, administered as a 15% solution. How many mls of the solution should be administered to a 150 pound patient?
*March 9, 2008 by melissa*

**Math 116 algebra please check**

Solve the following system of equations x + 6y =4(1) x = 9-6y (2) What is the solution of the system N There is no solution
*July 16, 2008 by jay jay*

**chemistry**

Ammonia acts as a base in aqueous solution; Kb is equal to 1.8 x 10-5. What is the Ka for the ammonium ion NH4+ in aqueous solution?
*October 31, 2008 by Megan*

**chemistry**

A dilute sulfuric acid solution that is 3.39 molality H2SO4 has a density of 1.18 g/mL. How many moles of H2SO4 are there in 375 mL of this solution?
*February 23, 2010 by Nick*

**chemistry**

The molarity of urea in a solution prepared by dissolving 16 g of urea (MW 60.0g/mol) in 39 g of H2O is ______M. The density of the solution is 1.3 g/ml.
*March 9, 2010 by CC*

**algebra**

Solve each inequality. State the solution set using interval notation and graph the solution set. 1-x<6 or -5+x<1
*April 6, 2010 by Marsha*

**math**

is each ordered pair a solution of the given system? write yes or no. 1. y=6x+12 2x-y=4 (-4, -12) 2. Y= -3x x=4y+1/2 (-1/2,3/2) 3.x+2y=2 2x+5y=2 (6,-2) 4. Solve the system by graphing. Check your solution. x + y=3 x - y=-1
*April 25, 2010 by Anonymous*

**chemistry**

A saturated solution of Mg(OH)2 is prepared having a large excess of Mg(OH)2. Sn(NO3)2 is added to the solution. Ksp = 1.9 10-11 for Mg(OH)2 and Ksp = 6.0 10-26 for Sn(OH)2.
*April 27, 2010 by Anonymous*

**Math**

The following equation has a positive and a negative solution. z-1/z+1 = 2/z+4 I need to find the positive solution, any ideas please?
*August 14, 2010 by Del*

**chemistry**

To what final volume should you dilute 50.5ml of a 4.75 M KI solution so that 27.5ml of the diluted solution contains 3.10g of KI
*October 24, 2010 by help*

**chemistry**

A stock solution is prepared by adding 26 mL of 1.1 M K3PO4 to enough water to make 30 mL. How many moles of K+ are in 21 mL of the stock solution?
*November 4, 2010 by Ashley*

**Chemistry...Help!!**

To what volume should you dilute 131 mL of an 8.20 M CuCl2 solution so that 49.0 mL of the diluted solution contains 4.53g CuCl2 ?
*December 7, 2010 by Lisa, Help needed!*

**chemistry**

explain why you get two different pH values for same solution when calculating and using pH meter of same solution?
*February 11, 2011 by kabelo*

**chemistry**

A sample containing .187 g cl is dissolved in 50.0 mL water. How many moles of cl ion are in the solution? what is the molarity of the cl ion in the solution?
*March 1, 2011 by kristen *

**chemistry**

I- is converted into I2 by the addition of an aqueous solution of KMnO4 to an aqueous solution of KI. What is the oxidation number assigned to I2??
*April 26, 2011 by Kayla*

**chemistry**

25cm3 of a solution of 0.1mol dm-3 NaoH reacts with 50cm3 of a solution of hydrochloric acid.What is the molarity of the acid
*June 21, 2011 by jonah*

**Chemistry**

Exactly 23.6 ml of a 0.131 N HCl solution was required for complete neutralization of 25.0 ml of an NaOH solution.What was normality of the NaOH?
*June 25, 2011 by Rajan Khare*

**Chemistry**

A solution of HCL (.1053 M) is added to a solution of NaOH (50.0 mL) It takes 28.31 mL if the acid to neutralize the base (naOH).
*October 2, 2011 by Nola*

**algebra**

how many mls of pure water does a pharmacist have to add to 50mls of a 15% minoxide solution to get a 10% minoxide solution?
*October 9, 2011 by rf*

**Math**

Solve two solutions. If there is a solution write it or I there isn't any write no solution. -3ly-3l = 9 (l l is absolute value sign)
*October 11, 2011 by Please help*

**chem**

What volume of a 8.50M Na2CO3 solution would be required to prepare 220.00mL of a 8.20%w/v Na2CO3 solution?
*November 29, 2011 by darren*

**chemistry**

i need to prepare 25.00 mL of a solution of a certain vitamin at a concentration of 2.00 mg/ml. how do i find the weight of the vitamin needed in the solution
*February 23, 2012 by marla*

**chemistry**

what is the molarity of a HCl solution that contains 13.0 g of HCl in 125 mL of solution? Answer in units of M is it 3791.944 ?
*March 8, 2012 by please help !*

**chemistry**

A solution of NaOH with pH 13.68 requires 35.00 mL of 0.128 M HClO_4_ to reach the equivalence point. What is the volume of the NaOH solution?
*March 8, 2012 by Savannah*

**Chemistry**

what volume, in L, of a 10.0M HCL solution is needed to make 2.00L of 2.00m HCL solution by dilution with water. Thank you
*September 1, 2012 by kate- Please help*

**Chemistry**

A solution of NaOH was obtained by dissolving 5.6g of NaOH pellets in 100cm^3 of water. What is the concentration of resulting solution?
*October 19, 2012 by HandsomeLala*

**Chemistry**

Why did you need to know the density of the bleach solution? Why didn't you measure the density of h2o2 solution as well? Stoichiometry lab problem
*October 28, 2012 by HELP PLEASE*

**chemistry**

Suppose you have 0.500 M sucrose stock solution. How do you prepare 250 mL of 0.348 M sucrose solution ?
*November 7, 2012 by tracy*

**Chemistry105**

A 10.00 mL volume of sulfuric acid required 23.65 mL of NaOH solution for complete neutralization. What is the molarity of the acid solution?
*December 18, 2012 by Mira*

**Linear Algebra**

Consider the system x-2y=k-1 4x+(1-k^2)y=8 For what values of k does the system have a. unique solution? b. infinitely many solutions? c. no solution?
*December 18, 2012 by Dan*

**Algebra**

X-2y=-1 2x+y=4 solve each system using elimination. Tell whether the system has one solution, many solutions, or no solution.
*January 30, 2013 by Candy*

**Chemistry**

What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?
*March 17, 2013 by Emma*

**Chemistry**

A 50mL solution of NaOH is neutralized by adding 37.5 mL of 0.045 M HCL. What was the original concentration of the NaOH solution?
*September 29, 2013 by Julie*

**Math! URGENT**

Describe the number of solutions for the equation. 5(x-9)=5x A. No solution B. One solution C. Infinite solutions Is the answer B? Thank You for any help.
*September 25, 2014 by Gwen*

**Math! URGENT**

Describe the number of solutions for the equation. -2(x-1)=2x-2 A. Infinite solutions B. One solution C. No solution Is the answer B?
*September 25, 2014 by Gwen*

**Science**

what is the concentration (M) of a MgCl2 solution prepared by dissolving 7.2 g of MgCl2 in sufficient water to give 362 mL of solution?
*November 4, 2014 by Eli*

**Chemistry**

Sulfite (SO3^2-) in wine was measured by the following procedure: 50.0ml of wine were added 5.00ml of solution containing (0.8043 g KIO3 + 5 g KI)/100ml. Acidification with 1.0ml of 6.0 M H2SO4 quantitatively converted IO3^- into I3^-. I3^- reacted with sulfite to generate ...
*October 24, 2011 by Ken*

**Chemistry**

1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...
*September 23, 2011 by Jack*

**Physical Science**

To create a supernaturated solution, a student heats a beaker of water on a hot plate and adds sugar until no more sugar will dissolve. The student then strains the solution through a funnel using filter paper and allows the solution to cool. Name two safety procedures the ...
*January 6, 2011 by Vegeta Super Saiyan 3*

**Physical Science**

To create a supernaturated solution, a student heats a beaker of water on a hot plate and adds sugar until no more sugar will dissolve. The student then strains the solution through a funnel using filter paper and allows the solution to cool. Name two safety procedures the ...
*January 7, 2011 by SHAZAM*

**Physical Science**

To create a supernaturated solution, a student heats a beaker of water on a hot plate and adds sugar until no more sugar will dissolve. The student then strains the solution through a funnel using filter paper and allows the solution to cool. Name two safety procedures the ...
*January 11, 2011 by Mr. Sandwich*

**Physical Science**

To create a supernaturated solution, a student heats a beaker of water on a hot plate and adds sugar until no more sugar will dissolve. The student then strains the solution through a funnel using filter paper and allows the solution to cool. Name two safety procedures the ...
*January 11, 2011 by Mr. Sandwich *

**Chemistry**

A 25.00 ml sample of a standard solution containing 1 g of CaCO3/L required 25.20 ml of EDTA to fully complex the Ca present. Calculate the volume of EDTA stoichiometrically equivalent to 1.0 mg of CaCO3. From the volume of EDTA required in titrating the sample, calculate the ...
*March 14, 2010 by Anonymous*

**Chemistry**

If 0.500 L of a 0.600 M SnSO4 solution is electrolyzed for a period of 30.00 min using a current of 4.60 A and inert electrodes, what is the final concentration of each ion remaining in the solution? (Assume that the volume of the solution does not change) I wanted to use the ...
*June 6, 2011 by Unknown*

**Alg help**

10(x-2) = 10 one solution no solution infinate solutions -2(y-3)= 2y- 6 one solution no solution infinate solutions
*January 15, 2014 by Aniston*

**Chem**

1) A 15.0 g sample of nickel metal is heated to 100.0 C and dropped into 55.0 g of water, initially at 23.0 C. Calculate the final temperature of the nickel and the water, if the specific heat capacity of nickel is 0.444 j / g x C. 2) In a coffee-cup calorimeter, 1.60 g of ...
*November 11, 2008 by Kim*

**Chemistry**

A 8.71 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of the acid. If 25.0 mL of 0.388 M barium hydroxide are required to neutralize the hydroiodic acid, what is the percent by weight of hydroiodic acid in the mixture? I understand how to solve ...
*November 20, 2011 by Hannah*

**chemistry**

There has to be a precipitate of calcium nitrate, Ca(NO3)2, and sodium chloride, NaCl because when I clicked none, it came out wrong. Please help http://en.wikipedia.org/wiki/Solubility check the solubility table there. Nitrates, and chlorides are soluble.
*October 29, 2006 by none*

**HARD chemistry**

A solution of ferrous sulfate (FeSO4) is titrated with a solution of potassium permanganate in sulfuric acid. The balanced half reactions are as follows: 10FeSO4 + 5 H2SO4 --> 5 Fe2(SO4)3 + 10 H ^+ +10e^- and 2 KMnO4 + # H2SO4 +10e^- --> 2 MnO4 + K2SO4 + 8 H2O. The gram-...
*January 4, 2010 by Amy*

**Physics**

How many years would it take the planet to orbit the sun. How do you calculate. All I have is, that the planet is 97 times farther from sun than earth or 97 Astronomical units Using Kepler's Law you find that the anser is 97^(1.5) years. You can estimate this without using a ...
*December 29, 2006 by Harry*

**college chemistry**

A) In some regions of the southwest United States, the water is very hard. For example, in Las Cruces, New Mexico, the tap water contains about 560 ug of dissolved solids per milliliter. Reverse osmosis units are marketed in this area of soften water. A typical unit exerts a ...
*April 28, 2010 by Stephanie*

**chemistry **

Compare the three types of bonds based on valence electrons. Explain why S-H bond lengths are longer than O-H bond lengths. Which element has a greater bond energy, oxygen or nitrogen and why. Determine if the following compounds are likely to have ionic or covalent bonds. a...
*December 13, 2010 by mido*

**Chemistry**

Specifications for lactated Ringer's solution, which is used for intravenous (IV) injections, are as follows for each 100mL of solution: 285-315 mg NA+ 14.1 - 17.3 mg K+ 4.9 - 6.0 mg Ca2+ 368 - 408 mg Cl 231 - 261 mg lactate, C3H5O3 How would you make this solution if you have...
*August 30, 2011 by Kevin*

**chemistry**

how many grams of BaO are in 1L of a 2.0 aqueous BaO solution (MW BaO = 153.3g/mole)?
*April 26, 2011 by jackie1*

**Chemistry**

how many milliliters of 0.0850 m naoh are required to titrate 50.0 ml of a solution that contains 1.85 g of hcl per liter to the equivalence point?
*February 22, 2011 by Charles Maxey*

**chem**

is a solution containing 35g of NaCl per 100g of water at 25 degrees Celsius, saturated, unsaturated, or supersaturated
*March 1, 2012 by nakisha*

**Chemistry**

How many milliters of 1.80M HCl are required to react with 30.0 grams of calcium hydroxide according to the given equation: CA(OH)2(s) + 2HCl(aq)> CaCl2(aq) + 2H2O(l)
*April 3, 2011 by Elaine*

**more chem**

What is the pH that would result from the addition of 0.002 moles of HCl to 100 mL of a 0.1 M boric acid/borate, pH= 9.2 buffer solution?
*February 7, 2008 by Anthony*

**Differential Calculus**

Given that p=(2q^2-5)^2. when q=3, it is increased by 0.7%. find the appropriate percentage in p. solution dp = 2(2q^2-5) (2dq) dp = (4x(18-5)(0.7%) dp = 4(13)(0.7%) am lost from here is dp=52x0.7/100= 0.364%
*August 14, 2009 by matrix school 2*

**chemistry**

Compute the freezing point of this solution: 25.5 g C7H11NO7S (4-nitro-2-toluenesulfoinoic acid dihydrate) in 100 g H2O. (nonionizing solute)
*August 4, 2010 by Les*

**Chemistry**

what is the molecular weight (G/mol) of a diprotic acid 0.43 sample that needed 35.46 ml of 0.100 M of NaOH solution to reach a phenolphthalein point?
*January 24, 2011 by Judy*

**chem**

What is the pH of 1.00 L of the buffer solution that contains 0.100 M HF and 0.120 M NaF after 0.020 mol of HNO3 is added? The Ka of HF is 3.5×10−4, and so pKa = 3.46.
*November 11, 2013 by Rebecca*

**Chemistry (Acid&Base)**

How many mL of 0.203 M HCl(aq) are required to prepare a diluted solution that has a concentration of 0.0433 M in a 100-mL volumetric flask?
*November 16, 2014 by Bill*

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