Ile gramów 45 % roztworu kwasu azotowego należy dodać do 120 g 20 % kwasu azotowego, aby potrzymać roztwór 30%?
x - poszukiwana wartość
120g * 1/5 = 24g
0,45 = 9/20
(0,45x + 24g)/(120g + x) = 3/10
360g + 3x = 4,5x + 240g
120g = 1,5x
x = 120 * 2/3 * g = 80g
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x - poszukiwana wartość
120g * 1/5 = 24g
0,45 = 9/20
(0,45x + 24g)/(120g + x) = 3/10
360g + 3x = 4,5x + 240g
120g = 1,5x
x = 120 * 2/3 * g = 80g