Edexcel IGCSE Chemistry 1.7C solubility practical

Practise solubility-practical questions by sequencing the method and explaining anomalous results from temperature or volume errors.

Exam points

Put flowchart steps in order for finding the solubility of a solid at a set temperature.
Suggest mistakes such as wrong water volume, poor temperature control or incomplete stirring.

[Maximum number: 2]

A student investigates the solubility of potassium nitrate in water.
She measures the masses of potassium nitrate that dissolve in 25 cm3 of water at different temperatures.

The table shows the student's results. One of the results is anomalous.

Table for Question 1.7C Solubility practical question 1 — Edexcel IGCSE Chemistry

Suggest two possible mistakes that could have caused the anomalous result.

1

2

Any two from

M1 less than $25 \mathrm{~cm}^{3}$ of water was used

M2 the temperature was less than $50^{\circ} \mathrm{C}$

M3 not enough potassium nitrate was added

M4 the solution was not stirred

ALLOW ECF from
incorrect plotting and
incorrect point circled
for M1 and M2 only

All question bank results loaded

1.7C Solubility practical question 1