Turn on thread page Beta
    • Thread Starter
    Offline

    3
    ReputationRep:
    I'm working on this question: What volume of dilute hydrochloric acid that has the concentration 0.050 mol dm-3 is needed to react with a tablet containing 400 mg of calcium carbonate?

    The first thing I did is wrote a balanced equation as follows (http://ca.answers.yahoo.com/question...0202727AAbwjZd):

    CaCO3(s) + 2HCl(aq) --> CaCl2(aq) + CO2(g) + H2O(l)

    After that, I calculated the number of moles CaCO3 as follows:
    #moles(CaCO3) = 0.4 g / 100 g mol-1 = 0.004 mol

    Now, based on the stoichiometry of the reaction, the number of moles of HCl will be 2 X 0.004 mol = 0.008 mol

    And, thus, based on this equation: concentration(mol dm-3) = number of moles (mol) / volume (dm3) we can caclulate the volume needed for HCl as follows:
    0.050 mol dm-3 = 0.008 mol / volume (dm3)
    volume = 0.008 mol / 0.050 mol dm-3 = 0.16 dm3

    Is this correct?

    Thanks.
    Offline

    11
    ReputationRep:
    (Original post by SWEngineer)
    I'm working on this question: What volume of dilute hydrochloric acid that has the concentration 0.050 mol dm-3 is needed to react with a tablet containing 400 mg of calcium carbonate?

    The first thing I did is wrote a balanced equation as follows (http://ca.answers.yahoo.com/question...0202727AAbwjZd):

    CaCO3(s) + 2HCl(aq) --> CaCl2(aq) + CO2(g) + H2O(l)

    After that, I calculated the [I]number of moles[I] CaCO3 has as follows:
    #moles(CaCO3) = 0.4 g / 100 g mole-1 = 0.004 mol

    Now, based on the stoichiometry of the reaction, the number of moles of HCl will be 2 X 0.004 mol = 0.008 mol

    And, thus, based on this equation: concentration(mol dm-3) = number of moles (mol) / volume (dm3) we can caclulate the volume needed for HCl as follows:
    0.050 mol dm-3 = 0.008 mol / volume (dm3)
    volume = 0.008 mol / 0.050 mol dm-3 = 0.16 dm3

    Is this correct?

    Thanks.
    yeah, i concur
    • Thread Starter
    Offline

    3
    ReputationRep:
    Thanks @shengoc. Who else agrees with this solution? :-)
    Offline

    0
    ReputationRep:
    Yeah I agree
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 19, 2011
Poll
Cats or dogs?

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.