Danielle Germaine Questiaux

3 Questions 4 Answers 0 Followers

Questions related from Danielle Germaine Questiaux

Should one cool or heat fluorosilicic acid when cleaning quartz grains?

I am trying to clean quartz grains from crushed granite ( about 1 mm grain size). HF would dissolve any silicate gangue mineral but would also dissolve the quartz grains. The recommendations I...

21 October 2022 4,046 3 View

How to prepare a solution of buffered etch oxide HF/NH4F so that the actual HF concentration is 4%?

I am cleaning quartz grains extracted from a granite with a 4% HF/2% HNO3 solution for about 40 hours. I was wondering whether a buffered solution would be slower but leave a cleaner surface as...

19 August 2022 2,041 0 View

Why is there a precipitate when mixing ascorbic acid and 1M HCl at 90°C?

I am attempting to sponatenous plate on silver Polonium present in digested mineral samples. I need the solution to be at a pH of about 0.5-1 and at a temperature of about 90°C. Testing the...

20 October 2018 6,135 4 View