Question

500 grams of perchlorous acid reacts with 1.25x 10²⁴ molecules of magnesium hydroxide via a double displacement reaction

a) Write a balanced chemical reaction

b) To the correct number of significant figures, what is the maximum amount of salt (in molecules) that can be produced

c) Does the reaction produce a basic or acidic solution

Answer 1

a) The balanced equation is , 2 HClO₄+Mg(OH)₂--------------Mg(ClO₄)₂ + 2 H₂0

b) Mass of Mg(ClO4)₂ = 500g HClO₄(1 mol HClO₄/100.46g HClO₄) ( 1 mol Mg(ClO₄)₂ / 2 mol HClO₄)                                              ( 223.206g Mg(ClO₄)₂ / 1 mol Mg(ClO₄)₂)

                                 =5554.48 g

No of moles of salt=555.48g / 223.206g

                           = 24.88 mol

No.of molecules= 24.886.02210²³

c) The reaction never produce a basic or acidic solution. It produce a neutral solutionn, that is this is a neutralization reaction.