Join TSR now and get all your revision questions answeredSign up now

Concentration Help - AS Watch

    • Thread Starter
    Offline

    2
    ReputationRep:
    Would anyone be willing to answer some concentration questions on page 4 of the exam paper. I have answered all of them correctly except question e)v) the last part where it gets a bit confusing for me.

    http://www.scribd.com/doc/79256965?s...g7hqi4oynpdlvy
    Offline

    2
    ReputationRep:
    i) burette
    ii) n=conc x vol = 0.05 x (26.4/1000) = 1.32x10-3moles (remember to always divide cm3 by 1000 to get dm3)
    iii) 2:1 ratio so 6.6x10-4 moles H2SO4 in 20cm3
    iv) conc = mol/vol = 6.6x10-4 / (20/1000) = 0.033 moldm-3
    v) But this was a watered down sample from 10cm3 to 250cm3, so the original concentration was 25x more. so 0.825 moldm-3
 
 
 
Poll
Is GoT overrated?

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

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