Hey there! Sign in to join this conversationNew here? Join for free
 You are Here: Home

# dont understand this question Watch

1. a 25cm3 sample taken from a stock solution of ammonia was mixed with 25 cm3 of a solution containing excess hydrochloric acid the temp rise was 0.7 dc

1) calculate the number of ammonia moles which have reacted i got
2.75280899 mol

2) calculate the concentration of the original stock solution
this is the 1 i need help on

i understand i would divide amount of moles by the volume (0.025 dm3) but were do i get the amount of moles from if its the original solution
2. How did you get the first answer? There must be more in the question for that part.
3. if they've given you a dT, have they given you a dH for the reaction as well? That would allow you to work E=mcdT then dH=E/no moles and work out how many moles of ammonia reacted. This would then be divisible by 0.025 to give the concentration.

Reply
Submit reply
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: December 22, 2010
Today on TSR

### Degrees to get rich!

... and the ones that won't

### Cambridge interviews pour in...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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

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