Std 9 ss paper solution 2022 || dhoran 9 samajik vigyan

A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was terted with universal indicator paper, its pH was found to be 9. (a) What does pH 9 tell us about the sodium salt solution. (b) Name one sodium salt which can produce such a solution.

A buffer solution of pH =9 can be prepared by mixing

Molality of an aqueous solution having 0.9 mole fraction of solvent is

Molarity and Molality of a solution of a liquid (molecular weight = 50) in aqueous solution is 9 and 18 respectively. What is the density of solution?