A mixture of copper sulfate and water is heated, leaving a residue of copper sulfate in the container. Which method was used to separate the mixture? A. evaporation

B. chromatography

C. distillation

D. filtration

Can someone me with questions 12 and 13 plz.

Identify two types of chemical bonding in the source of dietary potassium

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3