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I have a 500ml stock solution of 10 percent CaCl2 to prepare a 50 ml solution of 0.5 percent CaCl2. how would I prepare it
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(50 mL) x (0.5%) / (10%) = 2.5 mL
So take 2.5 mL of the stock solution, put it in a 50 mL volumetric flask, then fill the flask to its mark with solvent, then mix thoroughly.
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