Reacting acids with bases
4 marks · NormalMagnesium oxide reacts with hydrochloric acid in a beaker. Answer the following questions about this reaction.
State the names of the products formed in this reaction.
Write the balanced chemical equation for the reaction.
Describe the visible change that could be seen during this reaction.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) magnesium chloride and water · must show Both products named
(b) MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) · must show Correct reactants and products, Balanced chemical equation
(c) White magnesium oxide dissolves (disappears) · must show Solid disappears, Solution remains
Common mistakes: Incorrect formula for magnesium chloride; Omitting water as a product; Mistaking colour changes
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Marking points
B1 (a) · 1 mark · Both products correctly named: magnesium chloride and water.
M1 (b) · 1 mark · Correct reactants and products given in equation.
A1 (b) · 1 mark · Equation balanced correctly.
B2 (c) · 1 mark · States that magnesium oxide dissolves/disappears or the solid disappears.
Worked solution
a) The products are magnesium chloride and water.
b) The balanced chemical equation is:
c) During the reaction, the white solid magnesium oxide dissolves and disappears.