[O level Chemistry] - Dilution of NaOH(aq)

• Jasmine ngjiamin

  7 Oct 11, 23:11

  3. concentration of sodium hydroxide in a flask was found to be 8.0g/dm3 (call this solution X). What is the final concentration of the solution produced when 100 cm3 of distilled water is added to 100 cm3 of sol X?

  This is my solution:

  (100/1000) dm3 = 0.1 dm3                     distilled water: 0.1 dm3

  0.1 x 8g/dm3 = 0.8 g                                mol = conc x vol

  mol of NaOH: (0.8/40) = 0.02 mol           0.02 mol = conc x (0.1 +0.1) 

                                                                      (0.02 mol / 0.2) = conc 

                                                                                                 = 0.1 mol/dm3 #

  is this correct?

• Darkness_hacker99

  7 Oct 11, 23:49

  May I know the original volume of Sol X please?

• XFakerX

  8 Oct 11, 01:41

  Yep that's correct
• Darkness_hacker99

  8 Oct 11, 02:00

  Gosh!!!  How could I have missed that?