document.write( "Question 252331: Chemistry: Salt Solution. How much water must be evaporated from 32 ounces of a 4% salt solution to make a 6% salt solution? \n" ); document.write( "

Algebra.Com's Answer #184189 by oberobic(2304) $\"\"$ $\"About$

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A key concept is view this type of problem in terms of the amount of 'pure stuff' you need.
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\n" ); document.write( "You are told you have 32 oz of a 4% salt solution.
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\n" ); document.write( "4%(32) = .04*32 = 1.28 oz of pure salt.
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\n" ); document.write( "Given 1.28 oz of pure salt, how much 6% solution would that make?
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\n" ); document.write( "Let 'x' be the unknown volume. Solve...
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\n" ); document.write( "1.28/x = .06
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\n" ); document.write( "Rearranging...
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\n" ); document.write( "0.06x = 1.28
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\n" ); document.write( "Multiply both sides by 100 to remove the decimals
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\n" ); document.write( "6x = 128
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\n" ); document.write( "Divide both sides by 6.
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\n" ); document.write( "x = 21 1/3 = 21.3333
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\n" ); document.write( "So a 21.3333 oz solution containing 1.28 oz of salt will be a 6% solution.
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\n" ); document.write( "Looking back at the question, it asks how much must be evaporated.
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\n" ); document.write( "32 - 21 1/3 = 10 2/3 = 10.667
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\n" ); document.write( "Done. \n" ); document.write( "

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