PLEASE HELP. What is the original (LiOH] if the equivalence point of a titration is reached when 35.5 mL of 0.40 M HBr is added to 25.0 mL of LiOH?
A. 0.57 M B. 0.28 M. C. 0.014 M D. 0.024 M

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)]