Achemist places 2.5316 g of na 2so 4 in a 100 ml volumetric flask and adds water to the mark. she then pipets 15 ml of the resulting solution into a 50 ml volumetric flask and adds water to the mark and mixes to make a solution. she then pipets 15 ml of this new solution into a 50 ml volumetric flask and dilutes to the mark. determine the molar concentration of sodium sulfate in the most dilute solution prepared.

The concentration of the most dilute solution is 0.016M.

Explanation:

First, a solution is prepared and then it undergoes two subsequent dilutions. Let us calculate initial concentration:

First dilution

We can use the dilution rule:

C₁ x V₁ = C₂ x V₂

where

Ci are the concentrations

Vi are the volumes

1 and 2 refer to initial and final state, respectively.

In the first dilution,

C₁ = 0.178 M

V₁ = 15 mL

C₂ = unknown

V₂ = 50 mL

Then,

Second dilution

C₁ = 0.053 M

V₁ = 15 mL

C₂ = unknown

V₂ = 50 mL

Then,

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answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.