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Answer to the first question
1) The solution of vinegar and water with a pH of 6.2 is acidic.
A pH of less than 7 is acidic
A pH of 7 is neutral like water
A pH more than 7 is basic
Answer to second question
2) option number 2 which is hydrichloric acid is a strong acid and acetic acid is a weak acid
Acetic acid is a weak acid because it does not dissociate completely in aqueous solution -which in this case is water while hydrochloric completely dissociates in water makes it a strong acid.
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