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Titration calculation

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
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    The mineral cerussite consists of lead II carbonate, PbCO3. A particular lead ore consisted only of cerissute and inert rocky material. 1.00 g of crushed ore was added to 25cm3 of 1 moldm-3 nitric acid (an excess) in a beaker. A solution is formed and is made up to 250cm3 with water. A 25cm3 sample of this was titrated with 0.100 moldm-3 NaOH. 20.5 cm3 was required to produce a neutral solution.

    PbCO3 + 2HNO3 = Pb(NO3)2 + CO2 + H2O
    HNO3 + NaOH = NaNO3 + H2O

    a) calculate the number of moles of the nitric acid present in the original 25cm3 of 1 moldm-3 acid
    b) calculate the number of moles of nitric acid left after the reaction with ore
    c) calculate the no. of moles of lead II carbonate in 1g of the ore
    d) calculate the mass of lead which can be obtained from 1 tonne of the ore , assuming 100% extraction was possible.

    Pls help me

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    (Original post by Puddles the Monkey)
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