Turn on thread page Beta
 You are Here: Home >< A-levels

# titration watch

1. im stuck on this i dont know how to answer because usually id do moles/volume etc but i cant this question can u pls pls help me
3 A 25.0 cm3 portion of vinegar was transferred to a 100 cm3 volumetric flask and the solution made up to the mark with deionised water. 10.0 cm3 portions of this diluted vinegar required on average 13.60 cm3 of 0.200 mol dm−3 sodium hydroxide for neutralisation.
The equation for the reaction is:
CH3COOH  NaOH → CH3COONa  H2O
a Use the results to calculate the concentration of ethanoic acid in mol dm–3 of the diluted vinegar. (3 marks)
b Hence calculate the concentration of ethanoic acid in mol dm–3 of the undiluted vinegar. (2 marks)
c The density of this vinegar is 1.06 g cm–3. Use your answer to part b to calculate the concentration of ethanoic acid as a percentage by mass.
2. (Original post by jkjj)
im stuck on this i dont know how to answer because usually id do moles/volume etc but i cant this question can u pls pls help me
3 A 25.0 cm3 portion of vinegar was transferred to a 100 cm3 volumetric flask and the solution made up to the mark with deionised water. 10.0 cm3 portions of this diluted vinegar required on average 13.60 cm3 of 0.200 mol dm−3 sodium hydroxide for neutralisation.
The equation for the reaction is:
CH3COOH  NaOH → CH3COONa  H2O
a Use the results to calculate the concentration of ethanoic acid in mol dm–3 of the diluted vinegar. (3 marks)
b Hence calculate the concentration of ethanoic acid in mol dm–3 of the undiluted vinegar. (2 marks)
c The density of this vinegar is 1.06 g cm–3. Use your answer to part b to calculate the concentration of ethanoic acid as a percentage by mass.
Work out the no. moles of NaOH using volume X conc. then use stoichiometry (molar ratios) to find out no. of CH3COOH then divide by vol. to get conc. in diluted CH3COOH then scale up for the undiluted

Reply
Submit reply
Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 26, 2017
The home of Results and Clearing

### 2,431

people online now

### 1,567,000

students helped last year
Today on TSR

The latest news

### University open days

1. SAE Institute
Animation, Audio, Film, Games, Music, Business, Web Further education
Thu, 16 Aug '18
2. Bournemouth University
Clearing Open Day Undergraduate
Fri, 17 Aug '18
3. University of Bolton
Undergraduate Open Day Undergraduate
Fri, 17 Aug '18
Poll
Help with your A-levels

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Uni match

Our tool will help you find the perfect course for you

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Degrees without fees

Discover more about degree-level apprenticeships.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets

## Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.