SOLUTION: How much water should be added to 250 milliliters of 30% salt to make a mixture of 20% salt solution? What is the total volume of the 20% salt solution?
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Question 1065555: How much water should be added to 250 milliliters of 30% salt to make a mixture of 20% salt solution? What is the total volume of the 20% salt solution?
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How much water should be added to 250 milliliters of 30% salt to make a mixture of 20% salt solution?
What is the total volume of the 20% salt solution?
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Let W be the volume of water to add, in milliliters.
Then the volume of the new solution is 250+W milliliters.
The salt contents is and will be the same: 0.3*250 grams.
Related to 250+W milliliters of solution, the new concentration is
.
It should be 20% concentration, which gives you an equation
= 0.2, or
0.3*250 = 0.2*(250+W),
75 = 50 + 0.2W ---> 0.2W = 75-50 = 25 ---> W = = 125.
Answer. 125 milliliters of water must be added.
