Question

tron 120 gam dung dich NaOH 20%voi 180 gam dung dich NaOH 15%. Dung dich duoc sau khi tron co C%la bao nhieu 

Answer 1

\(m_{dd\ sau\ pư} = 120 + 180 = 300(gam)\\ m_{NaOH} = 120.20\% + 180.15\% = 51(gam)\\ C\%_{NaOH} = \dfrac{51}{300}.100\% = 17\%\)

Answer 2

mdd sau pư=120+180=300(gam)mNaOH=120.20%+180.15%=51(gam)C%NaOH=51300.100%=17%