# Chemistry

posted by .

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

## Similar Questions

1. ### English

I have an essay exam tomorrow, please can someone help me get some ideas about symbolic violence and how it effects men. I need it as soon as possible; because i have no idea about anything. Please someone help me!!!
2. ### chemistry help!

I have a chemistry test tomorrow and I'm trying to study but none of these questions in the book make sense to me:( Help! 1. Commericially available concentrated sulfuric acid is 95% H2SO4 by mass and has a density of 1.84g/mL. How …
3. ### CHEMISTRY--URGENT

HNO3 with pH 3 is mixed with 2 L KOH with pH 12. assuming volumes are additive what is the pH of the final solution?
4. ### Chemistry (URGENT)

Calculate the molarity of the Co^2+ ion in each of the solutions 1-5. The new molarity is given by the molarity of the stock solution multiplied by the dilution factor. Solution: Co(NO3)2 Original molarity: 0.160 Dilution #1: none …
5. ### Chemistry

Can someone please check to see if I am doing this correctly. 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 …
6. ### Chemistry

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 = ?
7. ### Chemistry, Science

How many Cl- ions are present in 2.35 mol of CaCl2 and please show steps ! Need help so I can study for a huge test tomorrow
8. ### Math

Check answer PLEASE!! Kevin wants to calculate the value of the expression below. -17 + 3 Which shows an equivalent way kevin could write this expression?
9. ### Chemistry

Calculate the new molarity of a 20.0 mL sample of 0.550 M CaCl2 solution that is diluted with water to make 250 mL of solution.
10. ### Chemistry

how do you solve for bond energy, I have a test tomorrow and i do not understand this concept. Can someone please put some examples, with steps also

More Similar Questions