1. What quantity of a 60% acid solution must be mixed with a 30% solution to produce 300 mL of a 50% solution?
2. A pot contains 6L of brine at a concentration of 120g/L. How much of the water should be boiled off to increase the concentration to 200 g/L?
3. A merchant blends tea that sells for $3.00 a pound with tea that sells for $2.75 a pound to produce 80 lbs of a mixture that sells for $2.90 a pound. How many pounds of each type of tea does the merchant use in the blend?© BrainMass Inc. brainmass.com March 5, 2021, 12:10 am ad1c9bdddf
1.What quantity of a 60% acid solution must be mixed with a 30% solution to produce 300 mL of a 50% solution?
Let x be the number of ml of 60% acid solution to be added to (300-x) ml of 30% acid solution to obtain 50% of 300 ml acid solution.
Formulate the equation as below and solve for x:
0.60x + 0.30(300 - x) = 0.50(300)
0.60x + 90 - 0.30x = 150
0.60x - 0.30x = 150 - 90
0.30x = 60
x = ...
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