Predict the reaction, if any, that would occur if Sr(NO3)2 and Na2CO3 were mixed. Would any reaction occur if HBr were added?

Question

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Answer 1

Dry Sr(NO3)2 and dry Na2CO3 will not react. If aqueous solutions, yes.
Sr(NO3)2(aq) + Na2CO3(aq) ==> SrCO3(aq) + 2NaNO3(aq)
If HBr is added, carbonate reacts with H^+ to produce H2O(aq) and CO2(g)