AP Chemistry problem on Additional Aspects of Aqueous Equilibria
The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 65.0 mL of 0.145 M HCl is _____
A) 1.314
B) 2.923
C) 0.744
D) 1.966
E) 7.148
Please help!! And explain! I have NO idea how to start...
________________
Obsession is a drop of water in the desert- crave it, savor it, remember it. ~Unknown
Manga Poll
Manga is the Japanese equivalent of comics
with a unique style and following. Join the revolution! Read some manga today!
Join #baka-updates @irc.irchighway.net
RSS Feed
Homework Help
From User
Message Body
Post #545342
Member
9:28 pm, Apr 12 2012
Posts: 53
Member
9:53 pm, Apr 12 2012
Posts: 260
@ crimsonsnow000117
I'm not sure if the answer is right but it should go like this:
mol of KOH = 45/1000 x 0.183 = 0.008235mol
mol of HCl = 65/1000 x 0.145 = 0.009425mol
SInce KOH is an alkali and HCl is and acid, neutralisaton occurs and since there is a HCl is greater in amount than KOH, option E is eliminated.
KOH + HCl = KCl + H2O + excess HCl
amount of excess HCl = 0.009425 - 0.008235 = 0.00119mol
Since HCl is a strong acid, pH = -log[H+]
[H+] = 0.00119/(0.045+0.065) = 0.010818mol (5sf)
pH= -log(0.010818) = 1.966 (4sf)
thus ans is D.
Please correct me if Im wrong!
I'm not sure if the answer is right but it should go like this:
mol of KOH = 45/1000 x 0.183 = 0.008235mol
mol of HCl = 65/1000 x 0.145 = 0.009425mol
SInce KOH is an alkali and HCl is and acid, neutralisaton occurs and since there is a HCl is greater in amount than KOH, option E is eliminated.
KOH + HCl = KCl + H2O + excess HCl
amount of excess HCl = 0.009425 - 0.008235 = 0.00119mol
Since HCl is a strong acid, pH = -log[H+]
[H+] = 0.00119/(0.045+0.065) = 0.010818mol (5sf)
pH= -log(0.010818) = 1.966 (4sf)
thus ans is D.
Please correct me if Im wrong!
Googled.
(: ,
Pika.
________________
(: ,
Pika.
________________
Quote from LawX
You are like the dense main character in a shoujo manga.
Quote from Crenshinibon
And you will murder someone one day, pika. If you're my daughter.
Post #545611
Member
1:32 pm, Apr 14 2012
Posts: 53
@marshy03
It is D! Thank you And thank you very much for the explanation. It was really helpful~
@Pikapu
Thanks
________________
Obsession is a drop of water in the desert- crave it, savor it, remember it. ~Unknown
It is D! Thank you And thank you very much for the explanation. It was really helpful~
@Pikapu
Thanks
________________
Obsession is a drop of water in the desert- crave it, savor it, remember it. ~Unknown
Post #552469
Member
8:34 pm, May 23 2012
Posts: 162
know any good way too combine these sentences?
East of Eden by John Steinbeck, is a novel that is filled with biblical allusions and is packed full of almost every theme imaginable. Themes of wickedness, goodness, love, rejection, guilt, and motherhood.
East of Eden by John Steinbeck, is a novel that is filled with biblical allusions and is packed full of almost every theme imaginable. Themes of wickedness, goodness, love, rejection, guilt, and motherhood.
Mishy
Member
8:40 pm, May 23 2012
Posts: 1737
Quote from yokeepsitreal
know any good way too combine these sentences?
East of Eden by John Steinbeck, is a novel that is filled with biblical allusions and is packed full of almost every theme imaginable. Themes of wickedness, goodness, love, rejection, guilt, and motherhood.
East of Eden by John Steinbeck, is a novel that is filled with biblical allusions and is packed full of almost every theme imaginable. Themes of wickedness, goodness, love, rejection, guilt, and motherhood.
An easy way that I can think of it just add "such as" after every theme imaginable.
ex: ...and is packed full of almost every theme imaginable, such as wickedness, goodness, love, etc.
________________
Nulla in mundo pax sincera
"Always go too far, because that's where you'll find the truth." - Albert Camus
Member
9:00 pm, May 23 2012
Posts: 162
Ohhh that was perfect! Thank you
Site Admin
9:45 pm, May 23 2012
Posts: 2275
East of Eden, by John Steinbeck, is a novel filled with biblical allusions and almost every theme imaginable: wickedness, ethicality, love, rejection, guilt, and maternalism.
Just to let you know, the last "sentence" is a sentence fragment; therefore, it couldn't stand alone anyway.
________________
"Officially, this machine doesn't exist, you didn't get it from me,
and I don't know you. Make sure it doesn't leave the building."
Just to let you know, the last "sentence" is a sentence fragment; therefore, it couldn't stand alone anyway.
________________
"Officially, this machine doesn't exist, you didn't get it from me,
and I don't know you. Make sure it doesn't leave the building."
Member
8:51 am, Sep 13 2012
Posts: 318
I swear to god I hate math questions like this, I have NEVER understood them. Help, please! D:
A restaurant bill came to $60. If 15% of this amount was left as a tip, how much was the tip?
A restaurant bill came to $60. If 15% of this amount was left as a tip, how much was the tip?
Mmm...Tasty
Member
9:06 am, Sep 13 2012
Posts: 497
Quote from neonkitty
I swear to god I hate math questions like this, I have NEVER understood them. Help, please! D:
A restaurant bill came to $60. If 15% of this amount was left as a tip, how much was the tip?
A restaurant bill came to $60. If 15% of this amount was left as a tip, how much was the tip?
15% of $60 is 60 x 0.15 = 9.
________________
Member
4:43 pm, Sep 13 2012
Posts: 318
Quote from WandereroftheDeep
15% of $60 is 60 x 0.15 = 9.
thank you so much!
Mmm...Tasty
Member
12:21 am, Sep 14 2012
Posts: 497
Quote from neonkitty
thank you so much!
You're welcome.
________________
Post #570161
Member
10:01 pm, Sep 15 2012
Posts: 9
Can anyone do some thermal physics?
A spherical balloon is filled with helium atoms (Note: 1 atm = 101.3 kPa).
(i) What is the total translational KE of the atoms if the balloon has a diameter 41.0 cm at 38.0 °C and the pressure inside the balloon is 121.6 kPa?
Answer is 6580.0 J respectively but I dunno what to do.
Last edited by qwertyqwerty11294 at 10:31 pm, Sep 15 2012
A spherical balloon is filled with helium atoms (Note: 1 atm = 101.3 kPa).
(i) What is the total translational KE of the atoms if the balloon has a diameter 41.0 cm at 38.0 °C and the pressure inside the balloon is 121.6 kPa?
Answer is 6580.0 J respectively but I dunno what to do.
Last edited by qwertyqwerty11294 at 10:31 pm, Sep 15 2012
the mu...
Member
12:18 pm, Sep 16 2012
Posts: 1050
Ek=(3/2)PV
..........
..........
Member
5:00 pm, Sep 16 2012
Posts: 318
This years salary, $50,220, is an 8% increase over last year's salary. What was last year's salary?
Search
- MANGA Fu
- News
- What's New!
- Series Stats
- Forums
- Releases
- Scanlators
- Series Info
- Mangaka
- Publishers
- Reviews
- Genres
- Categories
- FAQ
- Members
- API
- MEMBERS
- Sign Up
- TEAM-BU
- Admin CP
- About Us