Question

Which of the following pairs contains a conjugate acid-base pair?
Perchloric acid and chloric acid.
Hydrochloric acid and sodium hydroxide.
Sodium cyanide and hydrocyanic acid.
Sodium bromide and bromous acid.

Answer 1

@Photon336

Answer 2

\[HClO_{4} ; HClO_{3}\] perchloric acid and chloric acid

Answer 3

Would that work if they are both acids though?

Answer 4

so remember a conjugate base pair, are the same compounds

Answer 5

for example what's the difference between these two compounds

\[HCL;CL^{-}\]

Answer 6

The one is an acid since it has H+

Answer 7

the only difference is an H+

Answer 8

\[CN^{-}; HCN \]

Answer 9

that's one of the answer choices what about this one?

Answer 10

@Photon336 the second one has a H+

Answer 11

but what do you notice about it ?

Answer 12

The CN had to be given H+ because it went from - to a +

Answer 13

@Photon336 Am I thinking in the right direction?

Answer 14

Yeah. Also, that's the definition of a conjugate acid-base pair. you have the same compound but the only difference is that you take away a proton from that compound.

Answer 15

take a look at this

\[NH_{3}/NH_{4}^{+}\]

Answer 16

IS this a conjugate acid base pair?

Answer 17

An H+ had to be given to the NH4+

Answer 18

okay, but is this a conjugate acid-base pair though?

Answer 19

Yes?

Answer 20

yep

Answer 21

Okay can we do the sodium ones? The whole thing with salts gets me confused.

Answer 22

that's a conjugate acid base pair.

Answer 23

the idea is that it's the same compound just remove a or add a proton

Answer 24

Hydrochloric acid and sodium hydroxide.

HCL/ NAOH

these aren't a conjugate acid base pair because they are different compounds.

Answer 25

@Photon336 So only the Perchloric acid and chloric acid is pair, correct? Sorry I just want to really make sure I got this.

Answer 26

@staldk3 remember, they've got to be the same compound for it to be a conjugate acid-base pair.

Answer 27

And they are the same basically right

Answer 28

yeah, so look for compounds that are the same just the only difference is an H+

Answer 29

Alright. Thanks. That makes more sense now

Answer 30

\[CH3COOH/CH3COO^{-}\]

Answer 31

@staldk3 What about this one? first ask your self is it the same compound then is there a H+ difference

Answer 32

that would be a pair. It gives away a H

Answer 33

are the compounds the same?

Answer 34

Yes

Answer 35

what about this one

H3O+/H2O

Answer 36

It loses a H so the H3O would serve as an acid while the H2O would be a base?

Answer 37

And it's the same

Answer 38

so let's look at HCL/CL-

HCL is our acid right?

and Cl- is our conjugate base

conjugate base means the compound when it has lost a proton. don't confuse it with base though they aren't the same.

Answer 39

Alright

Answer 40

so

HNO3/NO3-

1. IS this a conjugate acid base pair?
2. how do you know
3. what is the acid?
4. what is the conjugate base?

Answer 41

Yes.
H + is lost
HNO3
NO3-

Answer 42

excellent

Answer 43

Sweet. Thanks for the help and explanation

Answer 44

last one.

H2SO4, HSO4-

Answer 45

H+ is being removed since the second one is -

Answer 46

good

Answer 47

is this a conjugate acid base pair?

what is the acid ?
what is the conjugate base?

Answer 48

Yes
H2SO4
H2SO4-

Answer 49

good yeah that's all it is.

Answer 50

Thanks

Answer 51

no problem