Question

How would you identify the empirical formula of a compound CuCla bH2O.
You have at your disposal, an electronic balance and any other equipment you may need.

Answer 1

i just need the steps of how to find it

Answer 2

Haven't learned about this yet, but thank you for calling me, and I hope someone helps you soon. Good luck! ;D

Answer 3

can we use other chemicals for this ? or we can only use equipment s ?

Answer 4

we can use other chemicals as well

Answer 5

thankx @kewlgeek555

Answer 6

i think we can do it this way..
first we measure the initial mass ( m1)
second we heat it up to 100o C
this will remove the H2O in the sample

now we measure the mass again (m2)

the amount of H20 = ( m1 -m2)

Answer 7

can u write down the equation as well as u go

Answer 8

\[CuCl_{a}.bH_{2}O \rightarrow CuCl_{a} + bH_{2}O_{g}\]
this happens on heating..

now only CuCl_a is remaining...

and there r 2 ways.. and i dont know exactly which method u want ..so i will explain both methods

Answer 9

just go with the one where
water evaporates and then we r left with CuCla

Answer 10

first method is u react the CuCl_ a with NaOH

Answer 11

wht if i react with K instead of NaOH

Answer 12

OH!.. u r going to a displacement reaction ....
\[K + CuCl_{a} \rightarrow Cu + aKCl\]
u mean this ?

Answer 13

yup

Answer 14

then u r going to measure the amount of Cu formed ?

Answer 15

yup

Answer 16

kk ... if u do that
u can find the
no. of moles of Cu in m2 mass of CuCl_a
so...from that u can find the mass of
Cl_a in it and them find the no. of moles in Cl which is a

Answer 17

yup thanks
thats wht i got
just wanted to ma

Answer 18

kk... i was going to form a precipitate using NaOH... guess my method was longer :(

Answer 19

oh no..... thanks
i have test so i have to study for it

no longer methods
thank you!!!

Answer 20

u r welcome :p