RP4 - temperature change

Cards (12)

what are we investigating in this experiment?
the temperature change in an exothermic reaction
how are we investigating this temperature change
by the neutralisation reaction between the hydrochloric acid and the alkali sodium hydroxide
whats the independant variable?
volume of the sodium hydroxide solution
what is the dependent variable
the maximum temperature reached
what are the control variables?
volume of hydrochloric acid and the concentration of both the hydrochloric acid and the sodium hydroxide solution
step 1?
measure 30cm of dilute hydrochloric acid with a measuring cylinder
step2
transfer the acid into a polystyrene cup and put the cup in a beaker, stopping it from falling
step 3
use a thermometer to measure the temperature of the acid recording the readings on a table
step 4
use a measuring cylinder to measure 5cm^3 of sodium hydroxide solution transferring it into the cup and fitting a plastic lid with a hole for the thermometer on top. (bulb of thermometer must be in solution.
step 5
use the thermometer to gently stir the solution (reaction is exothermic so it will release energy and the temperature of the solution will increase)
step 6
when temperature stops increasing, we record the highest temperature reached and repeat the experiment
how much do we increase the volume of sodium hydroxide solution
by 5cm^3 until a max. of 40cm^3 is reached