Sunday

December 21, 2014

December 21, 2014

Number of results: 17,919

**Chemistry**

1000 g of a 50% (mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution. How many liters of water should be added to the starting solution? Please show me the detail answer
*October 29, 2011 by Dewa*

**chemistry**

You extract the iron from a tablet and dilute that to 600.0 ml in a volumetric flask. You transfer 0.600 ml of this solution to a 75.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is 3.78 mg Fe/L (ppm). ...
*March 28, 2012 by leigh*

**chemistry**

Suppose that 50mL of a solution of sulfuric acid of unknown concentration was titrated with a 0.100M solution of sodium hydroxide. If it took 45.5 mL of titrant to reach the equivalence point, what was the concentration of the unknown solution of sulfuric acid???
*July 7, 2013 by Coach*

**Chemistry**

Consider the following reaction AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq) DH = -66 kJ Suppose that 100.0 mL of 0.100M AgNO3 is added to 200.0 mL of 0.100 M NaCl in a coffee cup calorimeter. Assuming that the initial temperature of the solution is 25.000C calculate ...
*November 15, 2014 by Mahnoor*

**chemistry**

A solution of acetic acid is prepared in water by adding 11.1 g of sodium acetate to a volumetric flask and bringing the volume to 1.0 L with water. The final pH is measured to be 5.25. What are the concentrations of acetate and acetic acid in solution? (Assume that the ...
*January 23, 2011 by medina*

**Chemistry - help please**

In an experiment, when 25 mL of 5.5 x 10^-3 M NaOH is mixed with 30 mL of 7.5 x 10^-3 M Fe(Br)2, a hydroxide compound is formed (Ksp = 1.8 x 10^15). Which of the following describes the resulting solution? a. The product is unsaturated b. The mixture product is saturated c. ...
*October 15, 2013 by Eren*

**Please help with Chemistry?????**

A standard solution with a FeSCN2+ concentration of 1.55x10^-4M has a percent transmittance (%T) of 18.8%. Another solution of unknown FeSCN2+ concentration has a percent transmittance of 44.8%. A) Calculate the absorbance (A) of each solution. B) Using the absorbances ...
*February 26, 2014 by Dan*

**Chemistry: ketone and aldehydes**

Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...
*November 29, 2008 by david*

**Chemistry **

3.a solution has 64 grams of HI dissolved in 250 L of water. what is its [H+] 4. What is the pH of the solution in question #3? 5. A solution has 189 grams of HNO3 dissolved in 1000 L of water. What is pH?
*February 25, 2014 by Emma *

**math**

log4(x-3)=2 4^2=x-3 16=x-3 19=x Does this mean the solution would be x=19 or no solution? How would I check this to know if 19 is a solution. I know I plug it back in. Like so: log4(19-3)=2 4^2=19-3 16=16 Did i check correctly?
*November 20, 2014 by Anonymous*

**chemistry**

In standardizing a potassium hydroxide solution, a student finds that 32.60mL of the base solution is needed to titrate 0.5045 grams of KHP to a phenolphthalein end point. In another titration, 26.63mL of this same base solution is needed to titrate 0.2003grams of an unknown ...
*March 14, 2014 by Anonymous*

**chemistry**

A 0.5215 gram sample of CaCO3 is dissolved in 12M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. How many moles of CaCO3 are used? What is the molarity of the Ca2+ in the 250 mL of solution? How many moles of Ca2+ ae in a 25.0 mL aliquot of the ...
*April 28, 2009 by saddee*

**Organic chemistry**

Assume that the partion compound is 3. Given 400mL of aqueous solution containg 12 g of compound. How many grams of A could be removed from the solution by a single extraction with 200mL of diethyl ether? Also how many total grams can be removed from the aqueous solution with ...
*September 28, 2010 by ZP*

**general, organic and biochemistry**

when a solution prepared by dissolving 4.00g of an unknown monoprotic acid in 1.00L of water is titrated with 0.600M NaOH, 38.7mL of the NaOH solution is needed to neutralize the acid. What was the molarity of the acid solution? what is the molecular weight of the unknown acid?
*November 23, 2010 by Ksolo*

**Chemistry...Help please!!!**

A solution of acetic acid is prepared in water by adding 11.1 g of sodium acetate to a volumetric flask and bringing the volume to 1.0 L with water. The final pH is measured to be 5.25. What are the concentrations of acetate and acetic acid in solution? (Assume that the ...
*January 23, 2011 by medina*

**chemistry**

The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55. °C results in a temperature decrease. Assume the specific heat of the resulting solution to be equal to that of pure water. Find...
*February 16, 2011 by kate*

**chemistry**

the following titration data were collected: a 10 mL portion of a unknown monoprotic acid solution was titrated with 1.12340 M NaOH and required 23.95 mL of the base solution for neutralization. calculate the molarity of the acid solution calculate the molarity of the acid ...
*October 25, 2011 by Doss*

**Chemistry**

Can someone please check to see if I am doing this correctly. Thank you :) Q) Calculate the new molarity of a 35mL sample of 0.450 M CaCl2 solution that is diluted with enough water to make 250 mL of solution. A) 0.450 m CaCl2 x 35mL/250mL = 0.063 mL diluted solution
*April 1, 2013 by Kishwa*

**chemistry**

A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 17.65 mL to reach a phenolphthalein end point. What is the molarity of...
*April 4, 2013 by Ashley*

**Chemistry**

A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 24.71 mL to reach a phenolphthalein end point. What is the molarity of...
*June 6, 2014 by Katie*

**chemistry**

22 mL of 0.37 mol per litre acetic acid is titrated by way of a standardized 0.29 mol/L KOH solution. Calculate the pH of the solution after roughly 18 mL of the solution of KOH is added. The Ka of acetic acid proves to be 1.8 x 10^-5
*April 9, 2008 by Joseph*

**Chemistry**

Suppose you have 1 l of acid solution. With a pH of 2" , you add 1 l of pure water to it, wat happens to the pH of the solution? Explain! Is it correct if i state: the pH of the acid solution becomes neutral since pure water is neutral??
*February 21, 2013 by Jessie*

**Chemistry**

When determining the pH of a solution, will the indicator react with and change the properties of the solution. No, not significantly.
*February 14, 2007 by KHNJ*

**chemistry**

You need to make 350mls of a 70% ethanol solution of EtOH from a 95% solution. How would you do this?
*January 23, 2008 by Kim*

**chemistry**

A saturated aqueous solution of calcium hydroxide has a pH of 12.25. What is the [Ca2+] of such a solution?
*March 18, 2008 by Anonymous*

**Algebra 1**

quadratic equation. ax^2+bx+c=0 Solution 1,only solution. Can you help me I am struggling to work this out.
*July 3, 2008 by Cynthia*

**Chemistry**

Consider a .900 M Al(NO3)3 solution. This solution has a nitrate ion concentration of:
*February 12, 2009 by Chris*

**Chemistry**

Describe how you would prepare 500 ml of a solution that is 40% bleach solution by volume.
*April 14, 2009 by Jessi*

**Chemistry**

Describe how you would prepare 500 ml of a solution that is 40% bleach solution by volume.
*April 14, 2009 by Jessi*

**chemistry**

A solution of salt in water conducts electricity, but a solution of sugar does not Explain why
*May 28, 2009 by john*

**algebra**

What's the solution to 5n+1=5n-1. Please tell me if it's no solution or all real numbers or something else.
*September 29, 2009 by Cristine*

**chemistry**

8.00 of are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?
*November 2, 2009 by katy*

**chemistry**

8.00 g of are dissolved in water to make 3.00 l of solution. What is the concentration of hydronium ions, , in this solution?
*November 15, 2009 by leo*

**chemistry**

What volume of a 2.90 M KI stock solution would you use to make 0.425 L of a 1.25 M KI solution?
*January 14, 2010 by a*

**Algebra**

Solve by the elimination method 2r-5s=1 5r+2s=46 The solution is _______, or there are infinitely many solutions, or there is no solution
*March 21, 2010 by Liz*

**math**

6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions
*March 27, 2010 by KiKi*

**chemistry**

a 1.00 L aqueous solution contained 5.80 g of NaOH. what is the pH of the solution? Can someone help me out with the setup of this?
*April 28, 2010 by Anna*

**chemistry**

How much water must be added if you want to make 1L of solution that is 6M, into a 3M solution
*April 29, 2010 by sarah*

**Chemistry**

Why is a NaOH solution disposed differently than a solution composed of Water and Nacl2
*May 6, 2010 by Marge*

**chemistry**

why does the pH of an aqueous solution change after HCl solution has been added
*June 15, 2010 by meredith*

**math**

Solve the following system of equations x + 4y=6 x= 4-4y A. The solution is an ordered pair ( , ) B. No Solution
*July 9, 2010 by christy*

**chemistry**

1 ml of diluted solution is added to 9 ml of deionized water. predist the ph of resulting solution
*July 30, 2010 by Anonymous*

**Chemistry**

An aqueous solution contains 2.6 %NaCl by mass. Calculate the molality of the solution.
*August 5, 2010 by ashley*

**Chemistry**

A solution having a volume of 3.0L contains 23 mmol of Oxygen 2. What is the molarity of this solution?
*October 3, 2010 by Elly*

**algebra**

solve the systems of equations {4/7x+y=2/7 -1/8x-3/4y=-11/4 a. the solution of the system is b. there are infinitely many solutions c. there is no solution
*October 17, 2010 by Anonymous*

**chemistry**

What volume of a 3.70 M KI stock solution would you use to make 0.400 L of a 1.25 M KI solution?
*November 4, 2010 by MaryBeth*

**chemistry**

What volume of a 3.70 M KI stock solution would you use to make 0.400 L of a 1.25 M KI solution?
*November 4, 2010 by MaryBeth*

**Pharm Tech**

how many milliliters of a 5% stock solution are needed to prepare 250ml of a 2% solution?
*November 4, 2010 by Kelsey*

**chemistry**

A 47.7-g sample of SrCl2 is dissolved in 112.5 mL of solution. Calculate the molarity of this solution.
*November 20, 2010 by Jessica*

**Chemistry**

How much of a 6.0 M sucrose solution should be used to make 81.0 mL of a 0.055 M solution?
*November 30, 2010 by Kelsey G*

**chem. 7**

a 20% solution of H2SO4 has a density of 1.14 g/mL. calculate the molarity, normality and molality of the solution.
*December 3, 2010 by Anonymous*

**Chemistry**

describe how you would make a 2.5L of a .100M KCL solution from a 5.5M stock solution
*December 5, 2010 by lily*

**Chemistry**

What is the molarity of the resulting solution when 300. mL of a 0.400 M solution is diluted to 800. mL?
*December 6, 2010 by Ivy*

**chemistry**

What volume of a 3.00 M KI stock solution would you use to make 0.270 L of a 1.25 M KI solution?
*January 23, 2011 by Nikki*

**chemistry**

calculate the molarity of the solution- 0.56 mole of BaCl2 in 100.0mL of solution.
*February 8, 2011 by brandy*

**chemistry**

An aqueos solution is 65%(v/v) rubbing alcohol.How many millimeters of water are in a 95-mL sample of this solution?
*February 13, 2011 by Hector*

**chemistry**

An aqueos solution is 65%(v/v) rubbing alcohol.How many millimeters of water are in a 95-mL sample of this solution?
*February 13, 2011 by Hector*

**chemistry**

find the pH of 10 mL of 1.00M solution after adding 10.00mL of indicator solution
*February 14, 2011 by Anonymous*

**chemistry**

What is the pH of a solution prepared by dissolving 7.5g HCl in water to make 375mL of solution?
*February 27, 2011 by Brittany*

**chemistry**

a certain solution contains 0.35 mol of HCl in 1200 mL of water. What is the pH of the solution?
*March 7, 2011 by leah*

**chemistry**

what is the molarity of solution made from the equivalent of 125 g of sodium nitrate in 1.0 l of solution
*March 15, 2011 by andrew b*

**chemistry**

To what volume should you dilute 20 mL of a 13 M stock solution to obtain a 0.560 M solution?
*April 22, 2011 by Kristen*

**chemistry**

how many ml of a 2M solution of HCl would be needed to neutrilize 2ml of a 5M solution of KOH?
*April 26, 2011 by jackie3*

**Math. **

1. 1/2(y-2)+2=3/8(3y-4) 2. Is 4 a solution? 3. Describe the process for finding out whether 4 is a solution to this equation.
*May 6, 2011 by Unknown. *

**Chemistry 2**

An aqueous solution of CuSO4 has a density of 1.3g/ml and is 1.16 molal. Calculate the Molarity of this solution.
*July 15, 2011 by Kelci*

**chem**

density of 20% by mass C2H6O2 solution in water is 1.03 g/mL. find the molarity of the solution.
*July 21, 2011 by lily*

**chemistry**

What is the pH of a solution in which 296 mL of HCl measured at 28.0 C and 1.02 atm, is dissolved in 1.5 L of aqueous solution?
*August 8, 2011 by Angel*

**chemistry**

Q: A 1.5L solution is prepared using 75g of calcium chloride. What is the molarity of this solution?
*December 5, 2011 by Anonymous*

**Chemistry**

A solution contains 1.53x10-3 M Ca(NO3)2, How many nitrate ions are there in 1.2x10-6 L (1.2 µL) of this solution?
*January 23, 2012 by Cahleb*

**Chemistry**

Calculate pH for strong base solution: 1.100 g of KOH in 550.0 mL of solution
*February 27, 2012 by Matt D*

**chemistry**

what volume should the solution diluted to create a 2.0M solution with a 5g of potassium hydroxide?
*April 24, 2012 by Shaunice*

**Chemistry**

What is the concentration of a solution of lithium carbonate containing 0.01 mol in 750 mL of solution
*June 13, 2012 by Nia Sharma*

**Science**

What is the pH of 115 mL of a 1.50 m solution of HNO2 that is titrated with a 1.50 M solution of LiOH at the equivelence point?
*June 20, 2012 by Jake*

**chemistry**

the dencity of 3 molal solution of NaOH is 1.110g/mL calculate the molarity of the solution
*June 30, 2012 by anant*

**pre-calculus**

solve the following inequality 16(x^2-1) >16x the solution set is? or there is no solution.
*September 22, 2012 by ladybug*

**math **

is it true that you only have to check your solution in a rational equation if the solution is 0?
*September 27, 2012 by Matt*

**Chem help please**

A solution is found to contain 1 x 10-4 OH− ions, determine the pH of this solution.
*November 16, 2012 by Trevor*

**chemistry**

Calculate the molarity of a solution containing 58.5mg of NaCl in 2.50mL of solution.
*November 30, 2012 by Emmanuel*

**algebra**

Does the system of equations have no solution, one solution, or infinitely many solutions? y = x + 4 y – 4 = x
*December 21, 2012 by Laura*

**algebra**

Does the system of equations have no solution, one solution, or infinitely many solutions? y = 2x – 3 y = –x + 3
*December 21, 2012 by Laura*

**chemistry**

What is the molarity of an HCl solution if 38.5 mL of it is titrated to the equivalence point with 41.6 mL of a 1.41 M NaOH solution?
*January 13, 2013 by Megan*

**math**

tell wheter the system has one solution, infinitely many solutions, or no solution: y=3x-14 y-x=10
*January 14, 2013 by Taylor*

**math**

tell whether the system has one solution, infinitely many solutions, or no solution: y=3x-14 y-x=10
*January 14, 2013 by Taylor*

**math**

Identify the solution(s) of the system of equations, if any. -2x-4y=1 12y=-6x-3 a) no solution b) (0,-1) c) (-1,0) d) infinitely many solutions
*January 27, 2013 by monet*

**chemistry**

Calculate the molarity of a solution that contains 48g of NaCl in 250ml of solution.
*February 7, 2013 by James*

**chem**

A weak acid HA is 1.0% dissociated in a 1.0 M solution. What would its percent dissociation be in a 5.0 M solution?
*February 25, 2013 by ston*

**Chemistry**

Calculate the morality of a solution that contains a 4.0 mol of a solute dissolved in 12.0L of solution
*March 4, 2013 by Francesca*

**algebra**

I need to find the solution or no solution or infinite solutions to these two equations. x + 2y =4 9x - 4y = 3
*March 5, 2013 by DJDiamond*

**Chemistry**

.012 mol of solid NaOH is added to a 1 L solution of HCl 0.01 M. What is the pH of the solution?
*May 13, 2013 by scilover*

**Math 116**

identify the solution (s) of the system of equations, if any. -3x-4y=2 8y=-6x-4 a. infinitely many solutions b. (-16/9, 5/6) c.(-2/3,0) d. no solution
*June 21, 2013 by Queta*

**Solution Set**

The Y-coordinate of the solution of the system {x+y=3 {-3x+2y=-19 the answer is -2 how? I've done everything to try to solve!
*July 18, 2013 by Sara*

**Chemistry **

9. A solution has 48 grams of LiOH dissovled In 100 L of water. What is its [OH-]? 10. What is the pH of the solution in question 9?
*February 26, 2014 by Emma *

**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 solu- tion?
*March 3, 2014 by Anonymous*

**chemistry**

8.22 g of CuNO3 is dissolved in water to make a 0.590M solution,what is the volume of the solution
*March 17, 2014 by Nicholas*

**Chemistry**

Calculate the volume of 2.00 M solution of KOH that is required to neutralize 30.0 mL of 1.00 M solution of HNO3.
*May 6, 2014 by Chemistry*

**Chemistry**

Calculate the volume of 2.00 M solution of KOH that is required to neutralize 30.0 mL of 1.00 M solution of HNO3.
*May 6, 2014 by Tina*

**Chemistry**

if you dissolve 25.5 g of KBr in enough water to make 1.75 L of solution, what is the molarity of the solution
*May 13, 2014 by Lori*

**Algebra**

What is the solution to the system of equations that contains –3x + y = 3 and 2x – y = –1? A. no solution B. (–1, 3) C. infinite number of solutions D. (–2, –3)
*June 16, 2014 by Emma*

**chemistry**

what is the molar concentration of a solution containing 15,0 g of pottasium chloride in 1,30 dm3 of solution
*August 18, 2014 by Anonymous*

**chemistry**

If 8.16 g of CuNO3 is dissolved in water to make a 0.500 M solution, what is the volume of the solution?
*November 9, 2014 by Dustin*

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