Compare the bond length, bond energy of CN and CN – species.
admin We will calculate the bond length, bond energy of CN and CN – species with the help of molecular orbital theory. Hence we first need the electronic configuration of the…
Assuming that the ionic character in H―Br bond is 20 percent. Calculate the fraction of the contribution of the ionic character to the valence bond wave function.
We know that combined wave function is given as: Ψ AB = Ψcovalent + λΨionic The percent ionic character is given by: X 100 Therefore, 20 = 100* 20 +…
Derive the hydrogen and hydroxyl ion concentration in aqueous solutions of acids and bases.
Hydrogen and hydroxyl ion concentration in aqueous solutions of acids and bases: The ionic product is very important quantity in aqueous solutions because it controls the relative concentrations of H+…
Calculate the pH of the 0.561 g of KOH dissolved in 200 mL of solution.
0.561 g of KOH dissolved in 200 mL of solution will have: Moles of KOH = 0.561 / 56 = 1.0 x 10-2 As molar mass of KOH = 56…
Calculate the pH if 1 mL of 13.6 M HCl is diluted with water to give 1 L of solution.Calculate the pH if 1 mL of 13.6 M HCl is diluted with water to give 1 L of solution.
1 mL of 13.6 M HCl is diluted with water to give 1 L of solution: Molarity of the diluted solution is given as: M1 V1 = M2 V2 13.6…
Calculate the pH of a sample of soft drink whose hydronium ion concentration is 3.8 x 10-3 M.
H3O+] = 3.8 x 10-3 pH = – log = – log (3.8 x 10-3) = – (log 3.8 – 3 log 10) = – log 3.8 + 3.0 =…
Calculate the pH of 10-8 M HCl.
If we use the relation, pH = – log , we get pH equal to 8. But this is not correct because an acidic solution cannot have pH greater than…
Derive the relationship between Ka and Kb for an acid and its conjugate base.
Conjugate acid and base are related as: Base + H+ <—————> acid Acid <—————–> H+ + base Let us consider a weak acid, HA HA (aq) + H2O < —————>…
Define pH or pH scale.
Sorensen in 1909 discovered a new tern for expressing the concentration of hydrogen ions known as pH or pH scale. The pH of a solution is defined as: The negative…
Calculate the dissociation constant of conjugate base of HF, Ka = 6.8 x 10-4.
We know that HF < ———–> H+ + F– Ka (acid) x Kb (conjugate base) = Kw = 1.0 x 10-14 Ka = 6.8 x 10-4 (given) Kb (F–) =…