Ile gramów KCl nalezy rozpuścić w 500g H2O, aby otrzymać roztwór 10%.
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Ile gramów KCl nalezy rozpuścić w 500g H2O, aby otrzymać roztwór 10%.
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C% = ms/mr × 100%
ms = 10% × (500+ms)/100%
100%ms = 10% × (500g+ms)
100%ms = 5000g% + 10%ms
90%ms = 5000g%
ms = 55,56g
ms = (C% * mr)/100%
ms = (10% * 500g)/100% = 50g