How can I check the accuracy of my reagents?

It’s rare that the SO2 reagents go bad, but if you are concerned about it, here is a method to check your SO2 reagents with vitamin C. Ascorbic Acid test

And here is how you can check the TA titrant: KHP test

To check the accuracy of your pH reference solutions and calibration:

pH test with cream of tartar

A quick way to check your calibration and pH accuracy is to measure the pH of a saturated solution of cream of tartar (AKA potassium bitartrate) which has a pH of 3.56 at 25 degrees celsius:
a. Get pure cream of tartar (grocery store stuff is fine, provided it’s pure), or reagent grade potassium bitartrate, also known as potassium acid tartrate or potassium hydrogen tartrate. Call it KHT for short.
b. place about 1/4 teaspoon of KHT in 20 mL of distilled water. Mix well for about 2 minutes. You want to be sure the solution is saturated, i.e., everything that can dissolve, has dissolved. There should be some undissolved solid left.
c. decant or filter off the solids from the liquid.
d. this solution has a standard pH of 3.56 at 25 degrees C (78 degrees F). It should be within 0.02 pH of this value at temperatures from 20 to 30 degrees Celsius.

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