Don’t use oranges, grapefruits, or other mild citrus fruits that don’t immediately taste tart. These are lower in citric acid content and your end result won’t be nearly as strong or effective.
If you can’t find 10% strength sodium hydroxide at your grocery store or chemical store, combine 10 millilitres (0. 042 c) of full-strength sodium hydroxide with 90 millilitres (0. 38 c) of water to make the chemical a lower strength. [4] X Research source
Your solution will separate quickly after taking it off of the heat.
If you get sulfuric acid on your skin, immediately stop what you are doing and flush the area with soapy water. It will irritate the acid, but it is much better to wash it off as best you can than leave it to burn your skin. [8] X Research source For severe burns, rinse the area with plenty of water as best as you can and go straight to the hospital.
If you want to make citric acid crystals, allow the solution to sit out and evaporate for about 1 to 2 weeks. You will see the crystals start to form over time, but be careful not to disturb it. You can crush these crystals to make powder. [10] X Research source
Citric acid crystals are available at many groceries, but it is sometimes called sour salt instead of its scientific name. You can also buy it at chemical stores.
For a stronger solution, boil 0. 5 US pints (240 ml) to 0. 75 US pints (350 ml) of distilled water per 1 pound (0. 45 kg) of citric acid. This will be better for cleaning and high-intensity uses for the acid. For a weaker solution, boil up to 2 US pints (950 ml) of distilled water per 1 pound (0. 45 kg) of citric acid. [12] X Research source This can be better for adding to drinks and foods so the flavor is not overpoweringly sour.
Make sure to use a steady stirring motion to ensure that as much citric acid crystals dissolve as possible.
