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26 April, 10:24

If it takes 50.0 mL of 0.5 M Ca (OH) 2 solution to completely neutralize 125 mL of HNO solution, what is the concentration of the HNO3 solution?

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  1. 26 April, 10:46
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    the balanced equation for the reaction is

    Ca (OH) ₂ + 2HNO₃ - --> Ca (NO₃) ₂ + 2H₂O

    Molar ratio of Ca (OH) ₂ to HNO₃ is 1:2

    Number of moles of Ca (OH) ₂ reacted - 0.5 moldm⁻³ x 50.0 x 10⁻³ dm³

    number of Ca (OH) ₂ moles - 0.025 mol

    according to the molar ratio

    1 mol of Ca (OH) ₂ reacts with 2 mol of HNO₃

    therefore 0.025 mol of Ca (OH) ₂ reacts with - 2 x 0.025 = 0.05 mol of HNO₃

    there are 0.05 mol of HNO₃ in 125 mL

    and concentration = number of moles / volume in 1 dm³

    concentration = 0.05 mol / 125 x 10⁻³ dm

    concentration of HNO₃ = 0.4 mol/dm³
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