84. Solving a chemistry problem
20. With the help of molecular and ion-molecular equations, answer the following questions: a) which salt solutions should be mixed to obtain calcium carbonate in the precipitate? b) can calcium carbonate be converted into calcium sulfate by the action of sodium sulfate on it (PRCaSO4 = 2.5 * 10-5; PRCaCO3 = 3.8 * 10-9)?
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