# Chemistry

posted by .

1. In order to make 250mL of a 0.100 M HNO3 solution from a 15.9 M stock solution, then _____mL if the 15.9 M stock HNO3 solution is needed.

M1V2=M2V2, solve for V2.
(0.100M * 250mL)/ 15.9M = 1.6mL

V2-V1=V
1.6mL-250= -248.4

Did I do this correctly?

• Chemistry -

Two picky points here.

1. You have 3 significant figures in 0.100 and three in 15.9 (and I'm calling 250 3 although some would call that only two since there is no decimal after the zero) so I would keep 3 in the answer and not round it to 1.6 (that is about 1.57 or so).
2. The question asks for mL of the 15.9M solution which you answered. You gave additional information about the amount of water to add to make up the 150 mL. However, fluids are not additive although at this concn I don't think there will be any difference but I always say, "Add 1.67 of the stock solution to a 250 mL volumetric flask and add distilled water to the mark of the volumetric flask." That may or may not be 248.4 mL but you really don't care how much H2O it is. If you follow those directions you will ALWAYS have the right concentration and it makes no difference, if done this way, if the volume of the two solutions are or are not additive.

## Similar Questions

1. ### Chemistry

You wish to prepare 0.18 M HNO3 from a stock solution of nitric acid that is 18.9 M. How many milliliters of the stock solution do you require to make up 1.00 L of 0.18 M HNO3?
2. ### Chemistry

You wish to prepare 0.18 M HNO3 from a stock solution of nitric acid that is 18.9 M. How many milliliters of the stock solution do you require to make up 1.00 L of 0.18 M HNO3?
3. ### Chemistry

Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate
4. ### CHEMISTRY

HOW YOU PREPARE 30.0ML OF 0.800M HNO3 FROM A STOCK SOLUTION OF 4.OOM HNO3?
5. ### GENERAL CHEMISTRY CALCULATION

preparing working solution of the disinfectant Osyl from the stock solution requires diluting the stock one part Osyl to five parts water .this is V/V solution .in this situation you have 250ml of water so the question is:HOW MUCH …
6. ### chemistry

How many milliliters of 16.0 M HNO3 stock solution wouuld be required to prepare 100.0mL of 3.00 M HNO3?
7. ### Chemistry

1. calculate the volume of concentrated HNO3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric …
8. ### Chemistry

If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution?
9. ### How many milliliters of a stock solution of 6.00 M

How many milliliters of a stock solution of 6.00 M HNO3 would you have to use to prepare 0.190 L of 0.490 M HNO3?
10. ### chemistry

A stock solution of HNO3 is prepared and found to contain 11.1 M of HNO3. If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L, the concentration of the diluted solution is ________ M.

More Similar Questions