Question

Determine whether a solid forms when solutions containing the following salts are mixed. If so, write the ionic equation and the net ionic equation.
KCl and Na2S

Answers

You need to study (and memorize) the solubilities of salts. Here is a simplified set of rules.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html

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