ChemDuino-Calorimetry to determine the enthalpy change of neutralization of an acid−base reaction: Making a familiar experiment “greener”

In thermochemistry experiments, a large volume and relatively high\nconcentration of chemicals are often used to get a significant temperature\nchange using an analogue thermometer. A greener experimental protocol is\ndeveloped as an alternative using modern microcontroller boards, ChemDuino. The\naim of this research is to develop a low cost and pocket sized prototype for\nmeasuring temperature of solutions using Arduino Uno and sensor based on green\nchemistry and Do It Yourself methods. The construction of ChemDuino for\ntemperature sensing is made in the simplest manner for individuals with little\nknowledge of electronics. The details of all components are stipulated in this\npaper. This research was conducted in three phases, which includes preliminary,\nprototype development, and assessment phase. The device is used to determine\nthe enthalpy change of neutralization of NaOH and HCl solution. The enthalpy\nchange of neutralization, kJ/mol at 25.0 {\\deg}C from literature is -57.13\nkJ/mol, whereas the enthalpy change of neutralization, kJ/mol at 25.0 {\\deg}C\nfrom the experiment using ChemDuino Calorimetry is -56.87 kJ/mol with the\nestimated standard deviation of 1.9. The device has successfully measured the\ntemperature change of the reaction at a relatively lower concentration.\nChemDuino Calorimetry has a great potential, because of its reliability and\naccuracy in measurements, inexpensive setup, and interconnectivity.\n