48% sulfuric acid from sodium bisulfate?

[studiocarter]

Photographer's Formulary sells sulfuric acid in 48%. I tried to substitute sodium bisulfate. I use it to reverse 16mm movie film. 10ml of 48% in a L with 5g Potassium Dichromate is my usual bleach and it works in 5 minuets. How do I use the powder in 5 min? I develop 16mm black and white movie film reversed.

Later, after a nap, I was supposed to use 65g in 1L + the Dichromate.

 

[Raghu Kuvempunagar]

10 ml of 48% is ~5 ml of concentrated sulphuric acid. You need to use ~22g of sodium bisulphate as the substitute.

For every gram of concentrated sulfuric acid or equivalent substitute 2.40 grams of anhydrous sodium bisulfate. If the recipe calls for concentrated sulfuric acid then 1 ml of acid weighs 1.84 grams. Therefore for 1 ml of concentrated acid substitute 4.42 grams of anhydrous sodium bisulfate.

Agfa-Gaveart reversal process uses the following bleach:
10.0 g potassium dichromate
120 ml 20% by weight sulphuric acid (equivalently 58g of bisulphate)
made up with water pH 1.0
2 min @20C

I've used this bleach for reversal of 35mm roll film and it works fine.

 

[studiocarter]

Thank you professor. concentrated sulfuric acid is how concentrated? I have used 48%, so this confused me. And 20% by weight also. Stronger acid should weigh more than weaker acid.