April 12, 2021, 10:24:58 PM
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Topic: Need help with concentrations:  (Read 170 times)

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Offline illotio

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Need help with concentrations:
« on: April 07, 2021, 04:39:21 PM »
Hi all,

I would need some help please, I am trying to find out an adequate concentration of Phosphoric acid to brush over steel and create a conversion layer that will improve the adhesion of Epoxy paint. Based on the study "Influence of Phosphoric Acid on the Adhesion Strength between Rusted Steel and Epoxy Coating" I would need to apply 50g/L of phosphoric acid. However I only have a bottle that contains 85% phosphoric acid. How many ml of phosphoric acid (85%)should I mix with deionised water if I want to have 100 ml of solution?

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Offline Borek

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Re: Need help with concentrations:
« Reply #1 on: April 07, 2021, 07:43:24 PM »
85% phosphoric acid has density of 1.69 g/mL. Take as much acid as needed, put it into 80 mL of water (actually any volume a bit smaller than required will do, note that adding concentrated acid to water is safer than the other way around), shake to mix, fill up to 100 mL.
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