The formula of the calcium ion is $C a^{2 +}$ and that of the acetate ion is $C H_{3} C O O^{-}$ . What is the formula of calcium acetate?

C a (C H_{3} C O O)_{2}

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C a C H_{3} C O O

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C a_{2} (C H_{2} C O O)_{2}

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C a_{2} C H_{3} C O O

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Solution

The correct option is A $C a (C H_{3} C O O)_{2}$
Valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. Cross multiplying the given valencies gives us:
${C a}^{2 +} {C H_{3} C O O}^{-} 2 ↘ ↙ 1 C a {({C H}_{3} C O O)}_{2}$

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