what is the pH of a solution prepared by moxing 150ml of 0.1M of HCl with 300ml of 0.1M of sodium acetate and diluting the mixture of 1 litre. The pka of acetic acid is 4.76

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]