First slide

PH of strong acids and strong bases

Question

Which of the following is correct?

Easy

A

The P^H of one litre solution containing 0.49g of H₂SO₄ is 2.0
B

The conjugate base of H₂S is S^2-
C

BF₃ is a Lewis base
D

Phenolphthalein is colourless in basic medium

Solution

$[H^{+}] = N = \frac{0.49}{49} = 10^{- 2} p^{H} = - \log [H^{+}] p^{H} = 2 \log 10$
P^H = 2
Conjugate base of H₂S is HS¯
BF₃ is a lewis acid
Phenolphthalein is pink in basic medium.

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