Consider the temperature change, together with the volume and concentration of t
ID: 708005 • Letter: C
Question
Consider the temperature change, together with the volume and concentration of the acid and base, noted in the HAZMAT team's response regulation information. Predict how each of the following variations would affect the observed temperature change. Explain your predictions.
(a) using 100 mL 1M hydrochloric acid and 100mL 1M sodium hydroxide
(b) using 50 mL 2M hydrochloric acid and 50 mL 2M sodium hydroxide
(c) using 25 mL 1M hydrochloric acid and 75 mL 1M sodium hydroxide
(d) using 25 mL 1M sulfuric acid and 75 mL 1M sodium hydroxide
Explanation / Answer
if we are adding base to acids then
a) temperature increases continuosly and reaches maximum at last drop. i.e when total base is added.
b) same as above temp increases continuosly and reaches maimum at last drop.
c) temp increases continuosly and reaches maximum when 25 ml sodium hydroxide is added. From there temeperature goes on decreasing ( since there is no acid left for neutralisation).
d) temp increases continuosly and reaches maximum when 50 ml sodium hydroxide is added( since 1 mole H2SO4 is neutralised by 2 mol NaOH). After that temp decreases gradually.