Edexcel IGCSE Chemistry 1.34C Solution concentration calculations

Practise solution concentration calculations using mol/dm3, cm3 to dm3 conversion, equations and titration volumes.

Exam points

calculate moles from concentration and volume, converting cm3 to dm3 correctly
use equation ratios in titration data to find an unknown acid or alkali concentration
work backwards from moles and concentration to calculate a neutralising volume in cm3

[Maximum number: 3]

This question is about magnesium metal and its compounds.

A student uses this method to make a solution of magnesium chloride.

Step 1. measure $25 \mathrm{~cm}^{3}$ of dilute hydrochloric acid into a beaker
Step 2 add magnesium powder a little at a time
Step 3 keep adding magnesium powder until it is in excess
Step 4 remove the excess magnesium powder by filtration

This is the equation for the reaction.

Figure for Question 1.34C Solution concentration calculations question 1 — Edexcel IGCSE Chemistry

Calculate the minimum mass of magnesium needed to react with $25.0 \mathrm{~cm}^{3}$ of $2.00 \mathrm{~mol} / \mathrm{dm}^{3}$ hydrochloric acid.
[for $\mathrm{Mg}, \mathrm{A}_{\mathrm{r}}=24$ ]

mass = g

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1.34C Solution concentration calculations question 1