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Question 56

A geochemist investigated the mass of dissolved mineral solids in a sample of geothermal brine from a volcanic well.

The geochemist used the following method:

Measure $cm350\text{ cm}^3$ of the geothermal brine sample.
Heat the sample in an evaporating basin until all the water has evaporated.
Measure the mass of the dry mineral residue that remains.
Repeat the experiment three more times.

Table 1

Sample	Mass of solid residue ( $g\text{g}$ )
1	1.42
2	1.39
3	1.45
4	1.34

Calculate the mean mass of the solid residue.

[2]

A $cm3300\text{ cm}^3$ sample of geothermal brine from a different well was found to contain $g2.46\text{ g}$ of dissolved solids. Calculate the mass of dissolved solids in $cm31000\text{ cm}^3$ of this brine.

[3]

Markscheme

3 Quantitative chemistry Questions

GCSE
Chemistry
3 Quantitative chemistry

3 Quantitative chemistry

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3 Quantitative chemistry

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Question 56

A geochemist investigated the mass of dissolved mineral solids in a sample of geothermal brine from a volcanic well.

The geochemist used the following method:

Measure $cm350\text{ cm}^3$ of the geothermal brine sample.
Heat the sample in an evaporating basin until all the water has evaporated.
Measure the mass of the dry mineral residue that remains.
Repeat the experiment three more times.

Table 1

Sample	Mass of solid residue ( $g\text{g}$ )
1	1.42
2	1.39
3	1.45
4	1.34

Calculate the mean mass of the solid residue.

[2]

[3]

Markscheme

3 Quantitative chemistry Questions

GCSE
Chemistry
3 Quantitative chemistry