in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 8 liters of 27% solution? your help is greatly appreciated!!!
2007-09-26 04:26:47 · 2 answers · asked by sugar lady 1 in Science & Mathematics ➔ Chemistry
obviously 3 liters needs to be added.
then using the equation
# of moles = n = cv = concentration * volume
you need
the # of moles of sodium hydroxide from the 5 liters PLUS the # of moles from the 3 liters to EQUAL the # of moles in the 8 liters
so
0.24*5 + c*3 = 0.27*8
then rearranging gives
c = (0.27*8 - 0.24*5)/3 = 0.32 = 32%
so you need
3 liters of 32% solution
the end
.
2007-09-26 04:37:38 · answer #1 · answered by The Wolf 6 · 2⤊ 0⤋
Volume is 3 litres. (8-5)
Conc. is (.27*8-.24*5)/3 = 0.32
i.e. conc. is 32%.
2007-09-26 11:34:22 · answer #2 · answered by ag_iitkgp 7 · 0⤊ 0⤋