Question

A chemistry teacher provides students with the amount of potassium hydroxide they need in solution form. The teacher makes the solution by dissolving 42. 1 g koh into 3. 0 l of solution.

Answer 1

Answer:For the enough dissolving of given moles each group will need to provide 92mL of solution.

Explanation: Molarity can be calculated as: M=n/V mol/L where, V=volume=3L(given)

n=no. of moles, which can be calculated as:

n=W/M, where

W= given mass=42.1g(given)

M=molar mass= 56.1g/mol (known)

We have to calculate molarity to determine the volume of solution of each groups. By putting value of n in the 1st equation, molarity can be calculated as M=42.1/56.1x3=0.250 mol/L.

It is given that each group has KOH solution of 0.023 moles. So, we can calculate the volume by using the 1st equation. M=n/V

0.250=0.023/V

V=0.023mol/0.250mol per L=0.092L=92ml

92ml of the solution will each group need to provide enough dissolved moles.