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2 August, 09:08

During a titration experiment water and salt are produced from 120.4 x 10²² molecules of Ca (OH) 2 reacting with 1.5 moles (HCI):

a.) Write out the balanced equation

b.) What is the limiting reagent?

c.) How much mass of each product is produced?

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  1. 2 August, 09:15
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    The balanced equation is as follows

    Ca (OH) 2 + 2 HCl = CaCl2 + 2H2O

    B) The limiting reagent is calculated as follows

    by use of Avogadro law constant that is 1 moles = 6.02 x10^23 molecules find the moles of Ca (OH) 2 used from 120.4 x10 ^22 molecules

    = 120.4 x10^22 / 6.02 x10^23 = 2moles

    the limiting reagent is therefore Hcl since it uses less moles

    c) the mass of each product

    mass = moles x molar mass

    by use of mole ratio of HCl to CaCl2 (2:1) the moles of CaCl2 = 1.5/2 = 0.75 moles

    mass of CaCl2 = 0.75 mol x111 g/mol = 83.24 grams

    by use of moles ratio of HCl to H2O (2:2) the moles of H2O is also 1.5 moles

    mass of H2O = 1.5moles x 18 g/mol = 27 grams
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