If 500 grams of water is added to 75 grams of 25% NaCl solution, what is the percent by mass of NaCl in the diluted solution?
Answer:
75*0.25 = mass of NaCl in the first solution
=18.75 g
after dilution what will be the total weight
75+500 = 575
now how can u calculate the mass percent?
18.75 g NaCl / 575 g Sol = 0.033 * 100% = 3.3%
75g on Nacl 25% contain 75*25/100 =18.75g on NaCL in a solution of 500+75 =575g
so the % is 18.75*100/575 =3.26% mass of NaCl
12.5 %
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