Homework Help: College Chemistry

Posted by Jessica on Monday, October 25, 2010 at 2:29pm.

1) A 25mL sample of the .265M HCI solution from the previous question is
titrated with a solution of NaOH. 28.25mL of the NaOH solution is required
to titrate the HCl. Calculate the molarity of the NaOH solution.

2) A 1.12g sample of an unknown
monoprotic acid is titrated with 29.15mL of .315M NaOH. Calculate the molar mass of the acid.

3) A student dissolves a 1.18g aspirin tablet in water and titrates the
solution with a .265M NaOH. 22.05mL of NaOH are required to reach the
equivalence point. Calculate the percentage of acetylsalicylic acid in the tablet.

College Chemistry - Anonymous, Monday, October 25, 2010 at 2:34pm
Wow,you are really wanting someone to do your homework for you. How many questions have you posted?!?!
College Chemistry - anonymous, Monday, October 25, 2010 at 2:35pm
yea this is to help not do all your work for u
College Chemistry - bobpursley, Monday, October 25, 2010 at 3:29pm
The titration equation

Heqacid*Molarityacid*volumeacid=Heqbase*Molaritybase*volumebase

where Heqacid=1 for monoprotic acid, 2 for diprotic, and 3 for triprotic acid
Heqbase=1 for single OH, 2 for two OH, and 3 for three OH
College Chemistry - Kaye, Tuesday, October 26, 2010 at 10:31pm
for your first question: first get a balanced equation, then calculate moles of HCl from that, then use the equation to get moles of NaOH and you use given information to get M NaOH
College Chemistry - Kaye, Tuesday, October 26, 2010 at 10:32pm
for your third question try using the equation (mass of acid/mass of tablet)x 100
College Chemistry - Kaye, Tuesday, October 26, 2010 at 10:32pm
for your third question try using the equation (mass of acid/mass of tablet)x 100

Answer this Question

Related Questions

acid-base titrations - For each of the following circumstances, indicate whether...
Chemistry - Can someone please explain me how to do this problem? A 25mL ...
difficult chemistry - 502g sample of dry cac03 and cacl2 mixture was dissolved ...
chemistry - Assuming the density of a 5% acetic acid solution is 1g/ml, ...
chemistry - 25mL of tap-water is titrated with .00500 M EDTA. 7.95mL of EDTA is ...
Chemistry - Unknown Acid: #2 Mass of Unknown solid acid transferred:0.414g ...
Chemistry - 3.42 grams of Ba(OH)2 is placed in a flask, dissolved in water, and ...
physical chemistry - find the ph of the solution that results from the addition ...
College Chemistry - I need help with this question!! a sample of pure KHP ...
Chemistry - Expt #1- Molecular Weight of Unknown Acid Unknown Acid: #2 Mass of ...

For Further Reading

First Name:
School Subject:
Answer: