Posted by **Kishwa** on Tuesday, April 2, 2013 at 8:19pm.

Urgent... Someone please help!!

Can someone please check to see if I am doing these correctly, I have a test tomorrow... Thank you :)

Q) Calculate the new molarity of a 35mL sample of 0.450 M CaCl2 solution that is diluted with enough water to make 250 mL of solution.

A) 0.450 m CaCl2 x 35mL/250mL = 0.063 mL diluted solution

_____________________________

Q) Calculate the new molarity of a 35mL sample of 0.450 M CaCl2 solution that is diluted with enough water to make 250 mL of solution.

A) M1V1 = M2V2

M1 = 0.450

M2 = ?

V1 = 0.035 L

V2 = 0.250 L

M2 = M1 X V1/V2

0.450 X (0.035L/0.250L) = 0.063

Given: 450 mL (0.450L); 0.250 M KNO

Need: Mass of KNO

___________________________________

Q) What mass of KNO3 (MW=101) is needed to prepare 450mL of 0.250 M KNO3 in water?

A) 0.450 L Solution x 0.250 M KNO/1 L solution x 101g KNO/1 mol KNO

= 11.4 g KNO

## Answer This Question

## Related Questions

- Chemistry - Can someone please check to see if I am doing this correctly. Thank ...
- Chemistry - Q) Calculate the new molarity of a 35mL sample of 0.450 M CaCl2 ...
- Chemistry - Calculate the new molarity of a 20.0 mL sample of 0.550 M CaCl2 ...
- Chemistry (URGENT) - Calculate the molarity of the Co^2+ ion in each of the ...
- CHEMISTRY--URGENT - HNO3 with pH 3 is mixed with 2 L KOH with pH 12. assuming ...
- CHECK MY CHEMISTRY WORK PLEASE ASAP - 1. You have been given a sample of unknown...
- CHEMISTRY URGENT - 1. You have been given a sample of unknown molarity. ...
- chemistry - If 2.1 moles of CaCl2 are dissolved in enough water to make a 0.92-...
- chemistry help asap please - You have been given a sample of unknown molarity. ...
- chemistry - calculate the molarity of 70.7g C2H6O in 2.25 L of solution, can ...

More Related Questions