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March 29, 2017

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when 6 M NaOH is slowly added to a solution containing chromium (III) ion, a precipate forms. However when an excess of 6 M NaOH is added, the precipated dissolves forming a complex ion with a coordination number of four.

1) write the formula of the precipitate.

2) write the formula of the complex ion.

i don't know how to do it

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