small

Question 1

what is a modification which would reduce the % error

Answer 1

greater mass of the reactant

reduces % uncertainty in triangle T

Question 2

when a small volume of water is added to the bufer the pH doesn’t change

why?

Answer 2

proportion of [HA]/[A-] is the same

Question 3

how could the student modify the experiment to be confident the rection was complete

Answer 3

reweigh to constant mass

Question 4

different Kw values at different temperature

water is neutral at all these temperatures

Answer 4

[H+] = [OH-]

in pure water

Question 5

why is it hard to predict whether the enthalpy of solution becomes more or less exothermic in MgF2 and MgI2

Answer 5

halide ions gets larger down group

lattice enthalpy is less exothermic down the group

hydration enthalpy is less exothermic down the group

difficult to predict whether lattice enthalpy or hydration has a bigger effect

Question 6

explain the significance of the expression Kp&raquo_space; 1

Answer 6

equilibrium position far to the right