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Answer:
acids of different pHs on some rock. They have decided to put rocks into beakers of acid at pH 1, 2, 3, 4, 5 and 6. They will leave the rocks in the beakers for two days. Then they will remove the rocks and weigh them. Which variable are Samia and Carlos changing? 2 Which variables do they need to keep the same? 3 What safety precautions do they need to take? 4 What do they need to do to the rocks before they start the investigation? 5 Construct a results table for this experiment.