Có: \(m_{NaOH\left(3\%\right)}=500.3\%=15\left(g\right)\)
\(m_{NaOH\left(10\%\right)}=300.10\%=30\left(g\right)\)
\(\Rightarrow C\%_{NaOH}=\dfrac{15+30}{500+300}.100\%=5,625\%\)
Bạn tham khảo nhé!
dd A 500 3 10-X
X
dd B 300 10 X-3
=> 500/300=10-X/X-3
=> X = 5,625
Vậy C% dd thu được là 5,625%