chemical eqilibrium: equations

Question 1

what is the equation of the ionisation of water?

Answer 1

H2O (l) + H2O (l) => H3O+ (aq) + OH- (aq)

Question 2

what does H3O+ (aq) represent in the ionsation of water equation?

what is a shorthand representation of H3O+ (aq)?

Answer 2

a hydronium ion (a hydrated proton)

H+ (aq)

Question 3

what is the dissociation constant for the ionisation of water known as and what is it represented by?

Answer 3

ionic product (Kw)

Question 4

what is the equation for the dissociation of water?

Answer 4

Kw=[H3O+][OH-]

Question 5

the value of the ionic product varies w/ what?

Answer 5

temp

Question 6

what is the value of Kw at 25C?

Answer 6

1x10^-14

Question 7

give the equation of the relationship between pH and the hydrogen ion concentration

Answer 7

pH= -log10[H3O+] and [H3O+]=10^-ph

Question 8

in water and aqueous solutions w/ a pH value of 7 the concentrations of both H3O+ (aq) and OH- (aq) are both what at 25C?

Answer 8

10^-7 mol l^-1

Question 9

If the concentration of H30+ (aq) or the concentration of OH- (aq) is known, what can be used to calculate the concentration of the other ion?

Answer 9

Kw or pH +pOH=14

Question 10

what is the acid dissociation constant represented as and give the equations?

Answer 10

-Ka

Ka=[H3O+][A-]/[HA]
OR BY
pKa where pKa=-log10Ka

Question 11

what is used to calculate the approximate pH of a weak acid?

Answer 11

pH=1/2 pKa - 1/2log10c