A chemistry graduate student is given 300. ml of a 0.90M dimethylamine ((CH) NH) solution. Dimethylamine is a weak base with K,- 5.4 x 10 What mass of (CH,) NH,Br should the student dissolve in the (CH,), NH solution to turn it into a buffer with pH-10.21? You may assume that the volume of the solution doesn't change when the (CH,) NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

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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.