Question

please Answer this question step by step............​

Answer 1

Answer:

Answer:

Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.

Explanation:

To get the molarity, you divide the moles of solute by the litres of solution.

Molarity

=

moles of solute

litres of solution

For example, a 0.25 mol/L NaOH solution contains 0.25 mol of sodium hydroxide in every litre of solution.

To calculate the molarity of a solution, you need to know the number of moles of solute and the total volume of the solution.

To calculate molarity:

Calculate the number of moles of solute present.

Calculate the number of litres of solution present.

Divide the number of moles of solute by the number of litres of solution.

Explanation:

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Answer 2

Explanation:

$\sf 200mL \:0.1\:M\:solution\:is \: diluted\: by \: 800 \:mL \: of \: water \\ \\ \sf {M}_{1} = 0.1 M \:\:\:\:\:{V}_{1} = 200\:mL \\ \sf {M}_{2} = ? \:\:\:\:\:\:{V}_{2} = 1000 \:mL \\ \\ \sf Using\:molarity \: equation \\ \\ \sf {M}_{1}{V}_{1} ={M}_{2}{V}_{2} \\ \\ \sf Putting \: the \: values \; \\ \\ \sf \longrightarrow 0.1 × 200 = {M}_{2} × 1000 \\ \\ \sf \longrightarrow {M}_{2} = \frac{20}{1000} \\ \\ \sf \longrightarrow {M}_{2} = 0.02 \\ \\ \sf Molarity\:of\: final\:solution\:is\:0.02\:M$

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