20.State a control variable if you're investigating the effect of pH on the time taken for iodine to remain yellow.
Question
20.State a control variable if you're investigating the effect of pH on the time taken for iodine to remain yellow.
Solution
A control variable in this experiment could be the temperature at which the experiment is conducted. This means that you would keep the temperature constant throughout the experiment to ensure that any changes in the time taken for iodine to remain yellow are due to the pH level, not changes in temperature.
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16.State the independent variable if you're investigating the effect of pH on the time taken for iodine to remain yellow.
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