標題: 兩題chem mc [打印本頁] 作者: choice 時間: 21/10/2010 10:38 PM 標題: 兩題chem mc 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作者: someone 時間: 21/10/2010 11:12 PM 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作者: mk311111 時間: 22/10/2010 12:08 AM 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