41. The reaction shown below takes place when an electric current is passed thro

ID: 1022207 • Letter: 4

Question

41. The reaction shown below takes place when an electric current is passed through water. It is an example of a _____________________ reaction.

2H2O => 2H2 + O2

42. The concentration of H3O+ in your fruit smoothie is 4.3 x 10-11M. What is the pH of your smoothie?

45. How many moles of NaOH are in 25.0 mL of 0.212M NaOH? There are 1,000 ml per liter.

46. 25.0 mL of 0.212 M NaOH is neutralized by 13.6 mL of an HCl solution. The molarity of the HCl solution is...

The relevant balanced reaction is shown here:

NaOH + HCl => NaCl + H2O

41)

as water decomposes in presence of water it is said to be electrolytic decomposition reaction

42) pH = - log [H3O+]

pH = -log [4.3 x 10-11]

pH = 10.4

45) moles = molarity x volume in L

moles = 0.212 x (25 / 1000)

moles = 0.0053

46) moles of NaOH = 0.212 x (25 /1000) = 0.0053

so we need 0.0053 moles of HCl to neutralize

M = n /V

M = 0.0053 / 0.0136

M = 0.39

molty of HCl = 0.39 M

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