Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    Any help would be appriciated!! xx
    How many moles of hydroxide ions are present in 25cm3 of an aqueous solution of calcium hydroxide Ca(OH)2 of concentration 0.20mol????
    Offline

    14
    ReputationRep:
    mistake/.
    Offline

    0
    ReputationRep:
    (Original post by Little Willow)
    Any help would be appriciated!! xx
    How many moles of hydroxide ions are present in 25cm3 of an aqueous solution of calcium hydroxide Ca(OH)2 of concentration 0.20mol????
    The other person is wrong as there are twice as many moles of OH ions as there are Ca ions. Just work out how many moles overall and double it

    (concn x volume)/1000 = 0.005 moles CaOH2

    x2 = 0.01 moles
    Offline

    1
    ReputationRep:
    (Original post by Little Willow)
    Any help would be appriciated!! xx
    How many moles of hydroxide ions are present in 25cm3 of an aqueous solution of calcium hydroxide Ca(OH)2 of concentration 0.20mol????
    No. of moles= vol(cm3)/1000 x concentration
    0.20 x 25/1000= 5 x 10^-3
    As it is a diprotic base= 5x 10 ^-3 x 2=0.01
    Offline

    14
    ReputationRep:
    oh yeah
    sorry my mistake
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thank you both xxx
 
 
 

University open days

  1. University of Cambridge
    Christ's College Undergraduate
    Wed, 26 Sep '18
  2. Norwich University of the Arts
    Undergraduate Open Days Undergraduate
    Fri, 28 Sep '18
  3. Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 29 Sep '18
Poll
Which accompaniment is best?

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.