Calorimetry

Hi there,
You have a better chance of receiving a detailed answer under a video released to Calorimetry instead of these Support Forums. This video might work for you:
https://www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/chem19-calorimetry

Calorimetry and enthalpy introduction video adds a base to an acid. in chemistry we learn always add acid such that you get less of a chance of splattering.