Oxalic acid dihydrate, h2c2o4.2h2o, is often used as a primary standard for the standardization of base solutions. for a procedure comparable to this experiment, approximately how many grams of oxalic acid dihydrate should be used in order to have a volume of about 15ml of naoh solution (approximately 0.15m) for the tiration? the acid is diprotic (two h+ reacts).

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.