1 . In our text, Tro uses the formula M1V1 = M2V2 , where and M2 and V2 are the

Question

1 . In our text, Tro uses the formula M1V1 = M2V2 , where and M2 and V2 are the molarity and volume of the final diluted solution Courtney Harrington, in the video, uses the formula VsCs VoCD , where Mi and Vi are the molarity and volume of the initial concentrated solution Cs and Vs are the concentration and volume of the initial concentrated stock solution and Co and Vo are the concentration and volume of the final diliuted working solution. Same formula, different symbols. Use whichever version of the formula you like and solve this problem (answer given below): How would you prepare 20L of a 1.5 M NaNOs solution from a 6.0 M NaNOs stock solution?

Explanation / Answer

To solve this, we will use the formula,

VsCs = VDCD

Vs= Volume of stock solution (we need to calculate this)

Cs = concentration of stock solution = 6.0 M

VD = volume of dilute solution = 2.0 L

CD = concentration of dilute solution = 1.5 M

So, now we put the values in the formula,

VsCs = VDCD

Vs (6.0) = (2.0*1.5)

Vs = 0.5 L

So, to prepare this solution, we need to take a 2.0 L volumetric flask.

Add 0.5 L of 6.0 M NaNO3 stock solution and then add distilled water in the flask to make it to 2.0 L.

This will form 2.0 L of 1.5 M NaNO3 solution.

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