List the controlled, independent and dependent variable of these chemical reactions.

Chemical Reactions:
-Iron and copper (II) sulfate solution
-Lead (II) nitrate and potassium iodide solutions
-Magnesium metal and hydrochloric acid solution
-Electrolysis of water
-Burning magnesium

Phosphorous acid, h3po3(aq) , is a diprotic oxyacid that is an important compound in industry and agriculture. p k a1 p k a2 1.30 6.70 calculate the ph for each of the points in the titration of 50.0 ml of 1.5 m h3po3(aq) 1.5 m h 3 po 3 ( aq ) with 1.5 m koh(aq). 1.5 m koh ( aq ) .