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Question 3

The maximum mass of a solid that dissolves in 100 g100\text{ g}100 g of water at a given temperature is called its solubility.

The table gives the solubility of salt X at six different temperatures.

Temperature in ∘C^\circ\text{C}∘C203040506070
Solubility in g per 100 g100\text{ g}100 g of water3241536886107
a.

Plot the points on the grid and draw a curve of best fit.

A blank grid for plotting solubility against temperature. The horizontal axis is labeled 'temperature in °C' and has major markings from 10 to 80 in increments of 10. Each 10-degree interval is divided into 10 small squares, so each small square represents 1 °C. The vertical axis is labeled 'solubility in g per 100 g of water' and has major markings from 20 to 120 in increments of 10. Each 10 g interval is divided into 10 small squares, so each small square represents 1 g.

[2]
b.

Extend your curve to find the solubility of salt X at 10∘C10^\circ\text{C}10∘C.

[1]
c.

Use your graph to find the maximum mass of salt X that could dissolve in 50 g50\text{ g}50 g of water at 45∘C45^\circ\text{C}45∘C.

[2]

States of matter Questions

  1. IGCSE
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