How can we dissolve boric acid in water?

Boric acid has a relative low solubility, about 5 g / 100 mL in water at room temperature. It can dissolve up to about 27 g / 100 mL in hot water. So, it depends on how much boric acid you want to dissolve to decide if you have to do anything other than just put that in water.

Boric Acid Solubility

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11% (without any label following) implies mass % automatically. But boric acid can only dissolve about 5% maximum at room temperature. If you want to dissolve that much boric acid, you need to warm up the water. Or you can use basic solution. Boric acid is an acid, so it is more soluble in basic solution that in water.

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RE:

How can we dissolve boric acid in water?

Here is a web site that describes the solubility in water in more quantitative terms:

http://www.mandes.com.ar/technic-boric-acid.php

The numbers agree pretty well with those quoted in carborane's answer. Then again, he's a cage compound, so you never know ...

Just keep flushing more water many many gallons to dispense the acid to a safe level

as the sign typically says "Just Add Water"

warm the water and stir if it doesn't dissolve right away