1. A student was investigating the mass of dissolved solids in spring water.

The student carried out the following steps:

• Measure the mass of an empty evaporating basin

• Add 50 cm³ of spring water

• Heat up the water sample until it evaporates

• Reweigh the evaporating basin containing the solid

The following results were recorded:

• Mass of empty evaporating basin = 19.56 g

• Mass of evaporating basin and dry solid residue = 20.23 g

What is the mass of solid dissolved in 1 dm³ of the spring water?