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15) Ned Flanders mixed silver nitrate and sodium chloride. Immediately, Ned observed a white solid fall to the bottom of the beaker. He filtered and dried the solid and determined that it was silver chloride. What is the evidence that a chemical reaction occurred? Determine how much silver chloride Ned obtained and explain how you determined the answer. (Hint: law of conservation of mass)

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Answer is:  the evidence that a chemical reaction occurred is formation of white precipitate (change of color).

Balanced chemical reaction: AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq).

Solutions of silver nitrate and sodium chloride do not have color.

From chemical reaction: n(NaCl) : n(AgCl) = 1 : 1.

n(NaCl) = n(AgCl).

m(AgCl) = m(AgCl) · M(AgCl).

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