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This is because, as the hydrogen ions from the weak acid are used up, the weak acid dissociates further to replace these hydrogen ions, so that eventually the weak acid will produce the same number of hydrogen ions as the strong acid. Want to revise your knowledge of chemical equilibria? net 1 Which of the following parameters is the same for equal volumes of 0·1 mol l−1 solutions of sodium hydroxide and ammonia? A B C D pH of solution Mass of solute present Conductivity of solution Number of moles of hydrochloric acid needed for neutralisation 2 Which of the following statements is true about an aqueous solution of ammonia?

All carboxylic acids, such as methanoic acid and propanoic acid , are weak acids. Other weak acids include carbonic acid (an aqueous solution of carbon dioxide) and sulfurous acid (an aqueous solution of sulfur dioxide). The relevant equations for carbonic acid and sulfurous acid in the SQA Data Booklet are: More information about strong and weak acids can be found at www. e. all the available hydroxide ions are released into solution. Sodium hydroxide is a strong base. Strong bases include the oxides and hydroxides of the alkali metals and also the soluble oxides and hydroxides of the Group 2 metals, such as barium oxide and barium hydroxide.

4 of the SQA Data Booklet and you must be able to use them in calculations. A very useful expression that allows you to calculate the approximate pH of a weak acid from its dissociation constant is When water dissociates into ions, we can write the following equation and identify the conjugate acid and base: HA(aq) + H2O(l) ⇌ 34 + This can be written more simply as You will find values of Ka and pKa on p. 13 of the SQA Data Booklet.  4 of the SQA Data Booklet. The pKa of methanoic acid is given as 3·75 on p.

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