Question

2 Ag+NiO2+H20------->Ag2O+Ni(OH)2 name the element oxidized and name the element reduced

Answer 1

Oke the reaction \(\sf 2Ag+NiO_2+H_2O\to Ag_2O+Ni(OH)_2\)

When an element gets oxidized, it means it gaines electrons
This also means that the oxidation number decrease because eletrons have a negative charge
When an element gets reduced, it loses eletrons, ant the oxidation number increases.

So we need to find out where the oxidation number decreases and increases.
Oxygen is naturally 2- and hydrogen is naturally 1+
So the elements that get reduced/oxidized are Ag (silver) and Ni (nickel)

We'll start with Ag, it is in elemental form, so the oxidation number is 0.
after the arrow, Ag is in combination with oxygen. We know oxygen is 2-

\(\sf Ag_2O\)
The overall charge is 0
the O is 2-
We have 2x Ag so the oxidation number of Ag has to be 1+ (because 2x1=2+)

Now we know that the oxidation number in Ag increases, this means Ag gets reduced.

Answer 2

im so lost!

Answer 3

Where are you lost?

Answer 4

everything :( just keep going im trying to keep up

Answer 5

whats the element being oxidized

Answer 6

I can help you understand this. But just telling which one gets oxidized won't help you very much.

Lets do the same thing as above for nickel
but this time in steps.

Nickel is in combination with oxygen before the arrow.
\(\Large\sf NiO_2\)

We know that \(\sf O_2\) = 2-
so what is the oxidation number for 2xO?

Answer 7

-4

Answer 8

+4

Answer 9

no -4 is correct :)

Answer 10

okay
now what?

Answer 11

So when O2 is -4
what is the oxidation number of nickel?

Answer 12

+4?

Answer 13

Exactly! ;)

Now we have to remember that Ni = 4+

We do the same thing for nickel on the other side of the arrow.
\(\large\sf Ni(OH)_2\)

O= 2-
H= 1+
so what is the total oxidation number of \(\sf (OH)_2\) ?

Answer 14

-2?

Answer 15

2*-2 than add 2*1 and get -2...did i even do that right?

Answer 16

\(\sf (OH)_2\)
we have 2x O = 2x2- = 4-
and 2x H = 2x1+ = 2+
-4+2 = -2

So you're right :)

Now we know that (OH)2 = -2
what is the oxidation state of nickel?

Answer 17

+2

Answer 18

?

Answer 19

Yes

Answer 20

my online program is gonna lock me out soon so spending so much time on one problem can you just give me the answer please lol

Answer 21

So before the arrow, nickel was 4+, and after the arrow its 2+
that means the oxidation number decreases, so nickel gets oxidized

Answer 22

So the answers is:
Ag = reduced
Ni = oxidized

Answer 23

i got it wrong, its the other way around :(

Answer 24

i give up, lol thanks for your help though

Answer 25

Was my answer wrong?

Answer 26

it was wrong bc Ag=oxidized and Ni= reduced

Answer 27

hmm I did something wrong here... lemme check it

Answer 28

the oxidation number of nickel decreases, so it's reduced.
I did something wrong at the silver.

Answer 29

okay well thank you. i give up on my homework for now lol

Answer 30

I see what went wrong
I made a mistake at the oxidation number of Ag in AgO2
this is 2+, not 2-
so the oxidation number of silver increase, so it's oxidized

I'm terribly sorry for this :(

Answer 31

your fine

Answer 32

I must admit, this stuff can be pretty confusing sometimes :P