detection of labferment

Question 1

the action of rennin in the presence of Ca2+ ions results in

Answer 1

clotting of milk

Question 2

materials needed for the experiment

Answer 2

 Fresh milk
 Rennin solution (10 g/l)
 Ammonium oxalate (0.21 mol/l) - usd to bind the calcium ions 
 Calcium chloride (0.45 mol/l)
 Water bath at 37 °C