The equilibrium constants (ka) for hcn and hf in h2o at 25 degrees are 6.2e-10 and 7.2e-4,respectively. the relative order of base strengths including water is:

1) HCN

2) HF

Explanation:

∴ Ka1 = [H+]*[CN-] / [HCN] = 6.2 E-10

⇒ pKa1 = - log Ka1 = 9.2076

∴ Ka2 = [H+]*[F-] / [HF] = 7.2 E-4

⇒ pKa2 = - Log Ka2 = 3.1426

∴ Kw = [H3O+]*[OH-] = 1 E-14

∴ pKw = 14

∴ pKw = pKa + pKb

⇒ pKb1 = 14 - pKa1 = 14 - 9.2076 = 4.792

⇒ pKb2 = 14 - pKa2 = 14 - 3.1426 = 10.857

∴ pKb2 > pKb1

⇒ the relative order of base strengths:

1) HCN

2) HF

Because a reducide pKb is associated with a stronge base, while a large pKb revels a weak base.

law of conservation of matter

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.