Asked by nisha
how we prepare a 4M solution of NaCl in 100ml and after this we dillute this 4ml solution to make3.8M solution.
Answers
Answered by
DrBob222
How many mols NaCl do you want in the 100 mL? That's M x L = 4M x 0.1L = 0.4 mols.
How many grams is that? That's
mols = grams/molar mass. You know molar mass and mols, substitute and solve for grams. Place that amount NaCl in a 100 mL volumetric flask, add DI water, swirl until dissolved, add DI water to the mark of the flask, stopper and mix thoroughly.
Then the dilution. You made a typo; I assume that is a 4M solution not 4 mL. How much of this solution do you want? That is substituted for mL2.
mL1 x M1 = mL2 x M2
mL1 x 4M = mL2 x 3.8 M
How many grams is that? That's
mols = grams/molar mass. You know molar mass and mols, substitute and solve for grams. Place that amount NaCl in a 100 mL volumetric flask, add DI water, swirl until dissolved, add DI water to the mark of the flask, stopper and mix thoroughly.
Then the dilution. You made a typo; I assume that is a 4M solution not 4 mL. How much of this solution do you want? That is substituted for mL2.
mL1 x M1 = mL2 x M2
mL1 x 4M = mL2 x 3.8 M
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