SOLUTION: How many grams of water are needed to reduce 100g of a 30% acid solution to a 10% acid solution?

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Question 1037825: How many grams of water are needed to reduce 100g of a 30% acid solution to a 10% acid solution?
Answer by Alan3354(69443) About Me  (Show Source):
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How many grams of water are needed to reduce 100g of a 30% acid solution to a 10% acid solution?
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Method 1:
Add W grams.
100*30 + W*0 = (100+W)*10
10W + 1000 = 3000
W = 200 grams
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Method 2:
100 gms of 30% = 30 grams of acid
For 30 to be 10%, the total is 300 grams.
Add 200 grams.