The table lists some acids and bases. Strong acids Weak acids Weak bases Strong bases HBr CH sub 3 COOH NH sub 3 NaOH HNO sub 3 HCOOH NH sub 4 OH KOH cap h sub 2 SO sub 4 Ca OH sub 2 Which reaction yields a salt that has a pH is less than 7 ?

In choice A, the weak base NH₃ reacts with the strong acid HNO₃ to form NH₄NO₃. The NH₄⁺ ion is the conjugate acid of the weak base NH₃, so it makes the solution acidic; NO₃⁻ has little effect on pH. Therefore, this salt has a pH below 7.

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