0.376 grams of KHP are placed in an Erlenmeyer flask and some water and a drop of phenolphthalein is added to the flask.  The buret is filled with an NaOH (aq) solution of unknown concentration.  The NaOH solution is added dropwise to the flask containing KHP (aq).  After 12.78 mLs of the NaOH(aq) solution is added, the color of the solution is found to be faintly pink. What is the concentration (M) of the unknown NaOH solution based on this data alone?

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Q: (a) Calcium fluoride, CaF2, has Ksp= 4.0 x 10–11; what is the solubility of CaF2 in water?

A: The answer for part (a) is given below. Kindly post the other subparts as separate question

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.