$(a)$ If we take hydrochloric acid and acetic acid of the same concentration,which one will produce a lower $H^{+}$ ion concentration? Out of the two,which one is a weak acid?
$(b)$ If someone is suffering from acidity,which of the following would you suggest to cure it: vinegar,orange juice,or baking soda solution? Give a reason for your answer.

(D) $(i)$ Between hydrochloric acid and acetic acid of the same concentration,acetic acid will produce a lower concentration of $H^{+}$ ions because it is a weak acid that does not ionize completely in water.
$(ii)$ Acetic acid is the weak acid.
$(b)$ If someone is suffering from acidity,$I$ would suggest a baking soda solution to cure it. Baking soda is a mild base (sodium bicarbonate) that neutralizes the excess hydrochloric acid produced in the stomach,thereby providing relief.