Question

Water treatment plant receives a 5% polymer solution. Calculate how much polymer should be mixed with water to produce 350 gallons of a 0.5% solution.

Answer 1

Polymer to be mixed with water to produce 350 gallons of a 0.5% solution is 1.75 gallons.

Explanation:

Solution weight-age 100% = 350 gallons

Polymer weight-age = 0.5 % = ?

Water weight-age = 99.5 % = ?

100 =99.5 w + 0.5 p

350 = ? + ?

Using ratios

100 350

0.5 p

Applying the cross product rule

p = 350 *0.5/100= 1.75 gallons

Polymer to be mixed with water to produce 350 gallons of a 0.5% solution is 1.75 gallons

Using ratios

100 350

99.5 w

Applying the cross product rule

w = 350*99.5 /100= 348.25 gallons

Water to be mixed with water to produce 350 gallons of a 0.5% solution is 348.25 gallons