兩題chem mc

choice

1.Which of the following pairs of solutions give a neutral solution when mixed?
A. 10 mL of 1 M sulphuric acid and 10 mL of 1 M sodium hydroxide solution
B. 10 mL of 1 M sulphuric acid and 10 mL of 2 M sodium hydroxide solution
C. 10 mL of 2 M sulphuric acid and 20 mL of 1 M sodium hydroxide solution
D. 20 mL of 2 M sulphuric acid and 10 mL of 2 M sodium hydroxide solution


2.You have a solution of 2 M sodium chloride solution. If you want to prepare a solution of 0.1
M sodium chloride solution, how much water would you add to 50 mL original 2 M sodium chloride solution to produce the 0.1 M sodium chloride solution?
A. 200 mL
B. 50 mL
C. 950 mL
D. 450 mL

求步驟...thx

someone

1.B
因為H2SO4一次放2粒H+ ion,但係NaOH一次只放到1粒OH- ion
所以ratio要1:2

mk311111

好吧 答了才移區=]

1. B  0.02 moles of H+ ions reacted with 0.02 moles of OH- ions

2. C  number of moles of NaCl=2(50/1000)=0.1(x+50)/1000