[URGENT] Chemistry Homework/Webassign

[T_Yamamoto]

DONE! Shout out to Zokudu and Chubbyfatazn for helping me. mnewsham, heres an early call out for you too, now go fence.
NIGHT

I have some problems that need to be solved.

1)

Spoiler

What is the pH of 325.0 mL of an aqueous solution containing 0.671 g of the strong acid trifluoromethane sulfonic acid (CF3SO3H)

Verified by chubbyfatazn

I got 1.86 but apparently thats wrong

EDIT: Webassign answer is WRONG. (POS)

2)

Spoiler

How many grams of solute are present in 40.0 mL of 1.33 M CoSO4?

Done, Thanks to Zokudu

3)

Spoiler

If 4.50 g of (NH4)2SO4 is dissolved in enough water to form 250. mL of solution, what is the molarity of the solution?

Done, Thanks to Zokudu

4)

Spoiler

How many milliliters of 0.510 M NiCl2 contain 1.00 g of solute?

Done, Thanks to Zokudu

5)

Spoiler

Indicate the concentration of each ion present in the solution formed by mixing the following. (Assume that the volumes are additive.) 40 mL of 0.100 M HCl and 10.0 mL of 0.570 M HCl. Find H+ and Cl-

Done, Thanks to my friend, M

6)

Spoiler

If you dilute 30.0 mL of the stock solution to a final volume of 1.00 L, what will be the concentration of the diluted solution?

Locked out due to 3 misses, good tries Zokudu

7)

Spoiler

What volume of 0.0100 M calcium hydroxide is required to neutralize 37.00 mL of 0.0250 M nitric acid?

Done, Thanks to Chubbyfatazn

If ATOT can solve this, I will be in your debt forever! Thanks!

-Takumi

 

[mnewsham]

Do you own work, you asked me to help you like 3 hours ago, what have you been doing since?

 

[Brainonska511]

6) If you dilute 30.0 mL of the stock solution to a final volume of 1.00 L, what will be the concentration of the diluted solution?

This question is so difficult...

1) What is the pH of 325.0 mL of an aqueous solution containing 0.671 g of the strong acid trifluoromethane sulfonic acid (CF3SO3H) I got 1.86 but apparently thats wrong

You could try calculating it using the Ka/pKa

 

[renz20003]

1) What is the pH of 325.0 mL of an aqueous solution containing 0.671 g of the strong acid trifluoromethane sulfonic acid (CF3SO3H)

2.12

2) How many grams of solute are present in 40.0 mL of 1.33 M CoSO4?

1.24g
3) If 4.50 g of (NH4)2SO4 is dissolved in enough water to form 250. mL of solution, what is the molarity of the solution?
extreme molarity
4) How many milliliters of 0.510 M NiCl2 contain 1.00 g of solute?
n/a
5) Indicate the concentration of each ion present in the solution formed by mixing the following. (Assume that the volumes are additive.) 40 mL of 0.100 M HCl and 10.0 mL of 0.570 M HCl. Find H+ and Cl-
34%
6) If you dilute 30.0 mL of the stock solution to a final volume of 1.00 L, what will be the concentration of the diluted solution?
really fucking concentrated lol

I tried :\, i remember why i hated school, thanks!

 

[MaxFusion16]

This is high school level chem, easy bs.

I hope you don't major in chemistry.

 

[zokudu]

Do your own homework.

 

[T_Yamamoto]

Do you own work, you asked me to help you like 3 hours ago, what have you been doing since?

I've been doing them

This question is so difficult...



That's what I got as well. Answer key wrong?

I don't know, happens occasionally

1) What is the pH of 325.0 mL of an aqueous solution containing 0.671 g of the strong acid trifluoromethane sulfonic acid (CF3SO3H)

2.12

2) How many grams of solute are present in 40.0 mL of 1.33 M CoSO4?

1.24g
3) If 4.50 g of (NH4)2SO4 is dissolved in enough water to form 250. mL of solution, what is the molarity of the solution?
extreme molarity
4) How many milliliters of 0.510 M NiCl2 contain 1.00 g of solute?
n/a
5) Indicate the concentration of each ion present in the solution formed by mixing the following. (Assume that the volumes are additive.) 40 mL of 0.100 M HCl and 10.0 mL of 0.570 M HCl. Find H+ and Cl-
34%
6) If you dilute 30.0 mL of the stock solution to a final volume of 1.00 L, what will be the concentration of the diluted solution?
really fucking concentrated lol

I tried :\, i remember why i hated school, thanks!

wrong answers

 

[T_Yamamoto]

This is high school level chem, easy bs.

I hope you don't major in chemistry.

im not, polisci is my planned major

 

[T_Yamamoto]

Do your own homework.

"For 2:
40 mL * (1L/1000mL) * (1.33 moles CoSO4 / 1L) = moles of CoSO4 then multiply by the molecular weight to get grams."

thats what you posted

 

[zokudu]

"For 2:
40 mL * (1L/1000mL) * (1.33 moles CoSO4 / 1L) = moles of CoSO4 then multiply by the molecular weight to get grams."

thats what you posted

I think it's wrong. I'm attempting to work it out again but until then I left a message to show you the scorn I feel for performing your work.

 

[T_Yamamoto]

I think it's wrong. I'm attempting to work it out again but until then I left a message to show you the scorn I feel for performing your work.

holy shit. you were right!
+1!

 

[Gibsons]

I hope you don't major in chemistry.

It wouldn't be a long lasting mistake.

 

[zokudu]

holy shit. you were right!
+1!

Damn I'm good working on some of the other ones. Cross it out in the OP so I know I'm amazing and finished it for you.

 

[T_Yamamoto]

Damn I'm good working on some of the other ones. Cross it out in the OP so I know I'm amazing and finished it for you.

done

 

[zokudu]

3:

4.5g * 1 mole/(132.1402g(mass of (NH4)2SO4)) = 0.03405 moles of (NH4)2SO4
0.03405 moles of (NH4)2SO4 / .25L of solution = .1362

 

[T_Yamamoto]

EDIT: Great job! COOOORRECT

 

[zokudu]

I got 1.36e-4 and thats not right apparently

I forgot to convert the mL to L when dividing for molarity. It should be ~.1362

 

[MagnusTheBrewer]

If only there was a class you could take where the teacher showed you how to solve these kinds of questions...

 

[T_Yamamoto]

If only there was a class you could take where the teacher showed you how to solve these kinds of questions...

exactly. our teacher got cancer (in her eye) so we have another chem teacher teaching us but didnt teach us everything

we have a test on this and other stuff tommorow
Ive been doing this since 7ish. havent showered yet.

 

[zokudu]

Try 8.249 for number 4.

 

[T_Yamamoto]

Try 8.249 for number 4.

wrong.:thumbsdown::\

i only get 3 tries per problem

 

[MagnusTheBrewer]

You need to understand the concepts not, the individual steps to solve a certain type of problem. Granted, the time frame you're dealing with allows for little else but rote memory. So, you need a plan for learning the material after you fail the test and, a plan to keep it from happening again. Then, take a shower.

 

[zokudu]

.194 for 5?

 

[Farmer]

Let me guess, NCSU freshman.

 

[T_Yamamoto]

You need to understand the concepts not, the individual steps to solve a certain type of problem. Granted, the time frame you're dealing with allows for little else but rote memory. So, you need a plan for learning the material after you fail the test and, a plan to keep it from happening again. Then, take a shower.

Theses are usually easy, but the fact is, theyll probably move the test back to Monday because we have over 118 people emailing all the chem teachers telling them the webassigns are fucked up and what not.

I just took a shower, bout to eat a snack