Hóa 8

M

mkcht

Y

yui_2000

a) C%=$\frac{m_{NaOH}}{m_{dd}}100=\frac{m_{}}{m_{ct}+m_{dm}}100=\frac{50}{50+150}100=25$ (%)
b) $m_{NaOH \ (2)}=$C%.$m_{dd}=$200.15%=30 (g)
C%=$\frac{m_{NaOH}}{m_{dd}}100=\frac{m_{NaOH \ (1)}+m_{NaOH \ (2)}}{m_{dd \ (1)}+m_{dd \ (2)}}100=\frac{50 + 30}{200+200}100=20$ (%)
 
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