Question

Dg of potassium hydroxide were dissolved in distilled water to make
100cm3 of solution. 50cm3 of the solution required 50cm3 of 2M nitric
acid for complete neutralization. Calculate the mass D, of potassium

Answer 1

Answer:

We should generally take commercial label concentrations, which are often given as wt% (where wt is often omitted or can be substituted by either wt., wt/wt, wt./wt., or m/m); as meaning: (mass of pure solute / mass of solution)·100%; even if this is not clearly stated. That also generically holds for chemical laboratory or engineering practice. Obviously, that would be not the case if such % concentrations were somewhere defined differently, or we have good reason to think that they should be understood differently.

Another concept is that of a formulation ratio. Such a ratio ― which may possibly be also given as a wt/wt ratio, or as a percent mass ratio ((wt/wt)·100%), and is often also denoted as wt% (as for concentration, above) ― should be generically understood as referring to the components before being mixed. Formulation ratios that refer to fluids are often given in volumetric basis (v/v).

Answer 2

Answer:

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