post lab discussion: exp. 2

Question 1

a common experimental method used to identify ions in a mixture

Answer 1

qualitative analysis

Question 2

cations

Answer 2

positively charged ions

Question 3

when do we need to develop an identification scheme

Answer 3

when the given solution contains one or more cation

Question 4

it involves the addition of a carefully selected reagent to an aq mixture of ions, resulting in the precipitation of one or more ions, while leaving the rest in solution

Answer 4

selective precipitation

Question 5

involve a color
change or formation of a
precipitate characteristic
of a particular ion

Answer 5

confirmatory tests

Question 6

centrifuge is a laboratory device that is used for the separation of ___, ___or ___, based on ___.

Answer 6

fluids
gas
liquid
density

Question 7

in centrifuge, separation is achieved by spinning a vessel containing material at ____

Answer 7

high speed

Question 8

true or false:
need to balance the centrifuge before you start

Answer 8

true

Question 9

how do you balance the centrifuge

Answer 9

by placing a test tube or test
tube containing water opposite to the test tube containing the precipitate in the centrifuge
they shld have approx. equal weights

Question 10

it is the process of separating by carefully pouring out (without disturbing the solid) the top layer of clear liquid into another container and leaving the lower layer with the solid

Answer 10

decantation