SOLUTION: Chandra has 3 liters of a 72% solution sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must ass to this in order to end up wi

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Question 858517: Chandra has 3 liters of a 72% solution sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must ass to this in order to end up with 8 liters of 32% solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.72%2A3+=+2.16+ = liters of sodium hydroxide
in 72% solution
+.32%2A8+=+2.56+ liters of sodium hydroxide
in final solution
+2.56+-+2.16+=+.4+ liters of sodium hydroxide
to be added
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Let +x+ = liters of solution to be added
+2.56+%2F+%28+3+%2B+x+%29+=+.32+
+2.56+=+.32%2A%28+3+%2B+x+%29+
+2.56+=+.96+%2B+.32x+
+.32x+=+1.6+
+x+=+5+
and
+.4%2F5+=+.08+
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5 liters of solution need to be added and
the concentration is 8%
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check:
+2.56+%2F+%28+3+%2B+x+%29+=+.32+
+2.56+%2F+%28+3+%2B+5+%29+=+.32+
+2.56+%2F+8+=+.32+
+2.56+=+.32%2A8+
+2.56+=+2.56+
OK