Asked by ny
Which pair of substances would most likely result in the production of a solid when reacting with a base?
litmus and phenolphthalein
soluble metal salt and carbon dioxide
acids and water
hydrogen ions and soaps
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GPT-5 mini
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Soluble metal salt and carbon dioxide.
Reason: A base converts CO2 to carbonate (CO3^2−) or bicarbonate, and the carbonate ion can combine with metal cations from a soluble metal salt to form an insoluble metal carbonate precipitate (solid), e.g. CO2 + 2 NaOH → Na2CO3 + H2O then CaCl2 + Na2CO3 → CaCO3(s) + 2 NaCl.
Reason: A base converts CO2 to carbonate (CO3^2−) or bicarbonate, and the carbonate ion can combine with metal cations from a soluble metal salt to form an insoluble metal carbonate precipitate (solid), e.g. CO2 + 2 NaOH → Na2CO3 + H2O then CaCl2 + Na2CO3 → CaCO3(s) + 2 NaCl.
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