You have a solution that contains ni 2 and pb 2 ions. you wish to use selective precipitation to separate the ions. you have available at your lab 0.500 m solutions of na2co3 and naoh. which solution should you add to your solution to achieve the best separation of nickel(ii) and lead(ii) ions

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

може ли да зареждате повече информация, моля

answerleaving cheese out to get moldy;