Question

Acid wash glassware amount of nitric acid per litre for water sampling

Answer 1

To prepare a chromic acid wash, mix 20 g of sodium or potassium chromate with sufficient distilled water to make a paste of chromate salt. Add 300 ml of concentrated sulfuric acid. Increase the proportions to make larger amounts. Use the mixture until it turns green in color.

Answer 2

Explanation:

Most new glassware is slightly alkaline in reaction. For precision chemical tests, new glassware should be soaked several hours in acid water (a 1% solution of hydrochloric or nitric acid) before washing. Brushes with wooden or plastic handles are recommended as they will not scratch or abrade the glass surface.