# >> Continuing Education >> Be Self Taught

How Do I Reduce Muriatic Acid From 30% to 20%?

Muriatic acid is another name for hydrochloric acid, chemical formula HCL. Reducing a HCL solution of 30 percent to 20 percent requires diluting the 30 percent HCL with water. Use the following formula to calculate how much water to add: Wt fraction 1 x Wt 1 = Wt fraction 2 x Wt 2. Wt fraction 1 equals the fraction of HCL, by weight, in the solution you want to reduce; Wt 1 equals the total weight of the HCL solution you want to reduce; Wt fraction 2 equals the fraction of HCL, by weight, in the reduced HCL solution you want; and Wt 2 equals the total weight of reduced HCL solution you want.

Weighing scale, minimum capacity 5 lbs, preferably with zero (tare) feature
32 oz. of 30 percent HCL
Glass container, minimum capacity 32 oz.
Water, minimum 10.7 oz.
Glass stirring rod

Instructions

- 1
  Select Wt fraction 1: as an example, 0.3 will be used.
- 2
  Select Wt fraction 2: as an example, 0.2 will be used.
- 3
  Select Wt 2: as an example, 32 oz. will be used.
- 4
  Insert these values into the formula, then calculate Wt 1: the answer is 21.3 oz.
- 5
  Subtract Wt 1 from 32. The answer is 10.7 oz.: this is the weight of water that must be mixed with 21.3 oz. of 30 percent HCL to create 32 oz. of 20 percent HCL.
- 6
  Place the glass container on the scale, then zero the scale [set the reading to zero].
  
  If the scale has no zero [tare] feature, then you must note the weight of the empty container.
- 7
  Add 10.7 oz. (303 g) of water to the container. Set the scale to zero, or note the total weight.
- 8
  Pour 21.3 oz. (604 gm) of 30 percent HCL, slowly and carefully, into the water while stirring with the glass rod. You now have 32 oz. of 20 percent HCL.

How to Learn Art at Home

How to Solve Math Linear Equations

Be Self Taught