b) Define the terms weak and strong acid. Which of the following acids are weak

Question

b) Define the terms weak and strong acid. Which of the following acids are weak acids: propanoic acid (CH3CH2CO2H) and nitric acid (HNO3)? When these are reacted with an equal amount of sodium hydroxide (a strong base) are the resulting solutions acidic, neutral, or basic?

c) You have been given a 45 g sample of a substance that is either NaI or acetanisole, C9H10O2 (both with Mw=150 g mol-1 ). When this is added to 850 g of water the freezing temperature is found to be –1.31°C. Given that for water KFP=-1.86 K kg mol-1 which compound is this likely to be and why?

Explanation / Answer

Weak Acids are those acids which dissociate partially in aqueous solution. Where as strong acids are completely dissociated. Propanoic acid is a weak acid because it doesnot ionize completely and HNO3 is a very strong acids as it dissociates completely.

propanoic acid + NaOH = CH3CH2COO-Na+ + H2O (overall solution is basic in nature)

HNO3 + NaOH = NaNO3 + H2O (overall solution is neutral as strong acid and strong base completely neutralized to each other.

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