Question

How many grams of silver could be plated out on a serving tray by electrolysis of silver in +1 oxidation state for a period of 8 hrs at current of 8.46 A?
what is the area of the tray if the thickness of silver plating is 0.00254 cm? density of silver is 10.5 g/cm^3

Answer 1

1. Do you know Faraday's constant?
2. Can you write down the equation of the reaction taking place?

Answer 2

yeah i got the first part of the question. i get the mass to be 272.178 gms. the second part is where i have a problem.

Answer 3

272 g is correct (btw, symbol for gram is g, not gms, which would be gram-metre-second).
Work out the volume of silver and divide by thickness of plating.

Answer 4

yeah- there are two ways to find out volume . one is using the mass and density relationship..if i use that, my answer will be correct.

Answer 5

but if i use stoichiometry, i wont get it -
22.4 litres of Ag -----> 108 g
x litres of Ag ------> 272.17 g
therefore x = 56.45 litres but using mass desity relationship , i get 25.92 litres

Answer 6

density*

Answer 7

"22.4 litres of Ag -----> 108 g"

Hey! silver is not a gas!! 22.4 L is volume under standard condition of one mole of gas!

Answer 8

In order to plate a serving tray, you need a few grams of silver.

Answer 9

oh so that is applicable only for gases?

Answer 10

Of course! Imagine having 1 mole (18 grams) of liquid water in a bottle. Would that bottle be 22.4 litres?

Answer 11

lol no! thanks again

Answer 12

Aren't you familiar with volumes in litres and millilitres, or masses in grams in India?
Even the Brits have turned to SI units in everyday life ;-)

Answer 13

yeah we are too!

Answer 14

I was joking and playing 'the-arrogant-French-who-invented-the-metric-system-two-hundred-years-ago'

Answer 15

haha yeah, you're french too! it was introduced by some french ruler whose name i forgot! we had learnt in great detail abut him and he got defeated in the waterloo

Answer 16

oh wait it was napoleon bonaparte!..he set an example for all of us..

Answer 17

Well, originally it was King Louis XVI before the 1789-revolution that started the idea. It was a joint project between the French Académie des sciences and the British Royal Academy.
Had not the French decided to behead their king, the British would not have withdrawn from the project and the whole world (incl. British colonies) would have been be metric for 200 years!
Napoleon conquered continental Europe and brought the metric system with him. When he was defeated, the countries decided to keep the new system as a positive advancement in science. But Napoleon never conquered Britannia, and England and the commonwealth remained 'Imperial' for many generations.

Answer 18

So how big is that silver-plated tray?

Answer 19

how do you know everything? youre like a human encyclopedia..if you study like that, people call me a geek and a nerd over here...so i tend not to study in front of my friends...and yeah i got it to be around 10204. 72 cm^2

Answer 20

Convert to m² and discuss.
I am just 'old', and I still read books! LoL !
There were lots of events in France when we celebrated the bicentennary of the metric system.

Answer 21

0.010204 m^2

Answer 22

No!
1 m = 100 cm
1 m² = 100² cm² = 10 000 cm²
1 m³ = 100³ cm³ = 1 000 000 cm³

Answer 23

sry 1.020472 m^2

Answer 24

1 m² should do it! So now discuss; can you imagine how such a big tray looks?

Answer 25

must be big enough..it encloses 1m^2 of area

Answer 26

What about the underside?