More white precipitate forms when 20 drops of 6 M NH4OH is added to the same test tube that contained the 6 M HCl. You may wonder if the precipitate formed in this step is really calcium oxalate since solid calcium hydroxide could also form. To investigate this possibility, 20 drops of 6 M NH4OH is added to the 3rd test tube containing only calcium chloride. What were your observations and what did they indicate about the identity of white precipitate?