Homework Help
13 years ago
Posts: 53
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
13 years ago
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!
Member13 years ago
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Pika.
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13 years ago
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
13 years ago
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.
13 years ago
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.
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
13 years ago
Posts: 162
Ohhh that was perfect! Thank you 😀
13 years ago
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.
[color=green]"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."[/color]
13 years ago
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?
13 years ago
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?
15% of $60 is 60 x 0.15 = 9.
13 years ago
Posts: 318
Quote from WandereroftheDeep
15% of $60 is 60 x 0.15 = 9.
thank you so much!
13 years ago
Posts: 497
Quote from neonkitty
thank you so much!
You're welcome.
13 years ago
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.
13 years ago
Posts: 1050
Ek=(3/2)PV
..........
13 years ago
Posts: 318
This years salary, $50,220, is an 8% increase over last year's salary. What was last year's salary?
