Eriochrome Black TS

Eriochrome Black is use in testing the hardness of water as well as testing of the Calcium and Magnesium serving as indicator. 

To prepare the solution, 

Dissolve 200 mg of eriochrome black T and 2 g of hydroxylamine hydrochloride in methanol to make 50 mL.

Share

How to Test for Hard Water

You can do a fairly reliable unscientific test to see if you have a problematic level of hard water in your home by doing the following test with liquid dish washing soap:

Take a clean empty plastic bottle having a cap (such as a clean, clear pop bottle);

Remove the cap;

Open your tap water faucet and fill the bottle with about a half-cup of water (8 to 10 ounces);

Add 10 drops of dish washing liquid;

Shake well;

If the soapy solution foams up quickly you are good and the water is not hard;

If it does not foam up but instead creates a milk-curd-like or soapy film on the water surface then the water is likely hard.

If you have hard water scale build-up on your shower door or white scale on your faucet aerator, this is also another indicator your water is too hard.

You can also send a water sample out for testing to a certified water testing laboratory. Hard water is anything above 1 grain of hardness per gallon. (A grain of hardness is an amount of calcium and magnesium equal in weight to a kernel of wheat).

• Less than 1.0 = Soft
• 1.0 - 3.5 = Slightly Hard
• 3.5 - 7.0 = Moderately Hard
• 7.0 - 10.5 = Hard
• Over 10.5 = Very Hard

Share