You are given 1 mol/dm3 sodium hydroxide, 1 mol/dm3 hydrochloric acid, phenolphthalein indicator and an unknown solution. How would you estimate the pH of the unknown solution? Draw a sketch and write a method

Talc (french chalk) is the ingredient

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.