pH calculations

Question 1

what is the formula for calculating pH

Answer 1

pH=−log[H+]

Question 2

what is the formula for calculating the hydrogen ion concentration from pH

Answer 2

[H+] = 10-pH

Question 3

what is the formula for calculating the hydrogen ion concentration from pH

Answer 3

[H+] = 10^-pH

Question 4

how can you use kw to work out the pH of a strong base

Answer 4

1) strong bases fully ionise in water so they donate one mole of OH- ions per base
2) this means the concentration of OH- ions is the same concentration as the base
3) [OH-] is linked to the ionic product of water so you can rearrange the kW=[H+][OH-] to find [H+]