Respuesta :

In this case, you know your solution volume( 237ml) and your solution strength (100%). You want to make a mixture that has 75% strength, which means it has 75% of ammonia and 25% is the diluting water. Then the calculation would be:

Water= 25%/75% x 237ml = 79ml of water. 
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Answer

79 ml


Explanation

You have 237 237 ml of​ ammonia, whose strength is​ 100%.

If you want to make it 75%, then;

let 75%  ⇒ 237 ml of ammonia and

   25% ⇒  x ml of water.

∴ x = (25% ×237) / 75%

       = 5,925/75

         = 79 ml of water.


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