Sofia and Zara are planning to investigate the solubility of two different substances,A and B, in water. They want to find out which is the most soluble. [3]For each pair of statements, tick (✓) the one that will help them to get the most accurate resultsand give a reason for your choice.a They use the same mass of water for each substance.They use a different mass of water for each substance.Because ________________________________________________________________________b They carry out the investigation using water at different temperatures.They carry out the investigation using water at the same temperature.Because ________________________________________________________________________c They count the numbers of spatulas of the substances added to the water.They measure the masses of the substances added to the water.
Question
Sofia and Zara are planning to investigate the solubility of two different substances,A and B, in water. They want to find out which is the most soluble. [3]For each pair of statements, tick (✓) the one that will help them to get the most accurate resultsand give a reason for your choice.a They use the same mass of water for each substance.They use a different mass of water for each substance.Because ________________________________________________________________________b They carry out the investigation using water at different temperatures.They carry out the investigation using water at the same temperature.Because ________________________________________________________________________c They count the numbers of spatulas of the substances added to the water.They measure the masses of the substances added to the water.
Solution
a. They use the same mass of water for each substance.
Because using the same mass of water ensures that any differences in solubility are due to the substances themselves and not variations in the amount of water.
b. They carry out the investigation using water at the same temperature.
Because temperature can affect solubility, so keeping the temperature constant ensures that any differences in solubility are due to the substances and not temperature variations.
c. They measure the masses of the substances added to the water.
Because measuring the masses provides a more precise and accurate way to quantify the amount of each substance, leading to more reliable results.
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