Question

do you want to make a sodium carbonate solution with a concentration of 2.5%. You have 50 mL of a 1% solution about how many milliliters of a 6% solution should you add

Answer 1

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Answer:

21 3/7 mL ≈ 21.43 mL

Explanation:

Let x represent the amount of 6% solution that should be added. The the total volume of sodium carbonate in the mix is ...

1%(50) +6%(x) = 2.5%(50 +x)

50 +6x = 125 +2.5x . . . . . multiply by 100, eliminate parentheses

3.5x = 75 . . . . . . . . . . . . . subtract 2.5x+50

x = 21 3/7 . . . . . . . . . . . . . divide by 3.5

21 3/7 mL, about 21.43 mL, of 6% solution should be added to make a 2.5% solution.