The spent acid from a nitration process contains 33% h2so4, 36% hno3 and 31% h2o. this is to be strengthened by the addition of concentrated h2so4 containing 95% h2so4 and nitric acid containing 78% hno3. the final strengths of mixed acid solution contains 40% h2so4 43% hno3 and the rest water. calculate : a. the amount of spent acid
b. the amount of concentrate h2so4
c. thr amount of concentrate hno3 to be mixed to produce 1500 kg of tge desired acid

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.