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Qs re pH » 3 Beer Effect

Posted by medlib on June 7, 2002, at 20:20:35

In reply to info- Fluid restrictions w/ Dex/Adderall extensive, posted by 3 Beer Effect on June 7, 2002, at 1:14:24

Hi 3B--

Re litmus paper: This usually comes in the form of test strips (available in well-equipped drug stores or chemical suppliers); but most litmus paper is "narrow range" (measures pH 5.5-7.5). Probably, what you need is called "pH paper", which measures the full range pH 1-14. You can get 100 strips for $3 at www.learning resources.com (use search function). UT bookstore might possibly have it for chem labs. Or you can boil, then strain, chopped up red cabbage. The resulting liquid is an acid/base indicator (color change). The anthocyanins in the liquid are the same used in litmus paper.

Re pH of urine: Yes, dehydration increases acidity of urine (mostly due to increased concentration of uric acid).

Re: pH of food and drinks: A high protein diet produces very acidic urine; a vegetarian diet (high CHOs) produces basic (alkaline) urine. Your "balanced meal" has a pH about 6 (assuming you actually eat the vegetables).

The pH of black tea (used to make iced tea) depends on the kind of tea used. I've seen values from 4.9 to 6.4. (pH of black coffee is about 5). Lemon tea is about 3.7. V8 is mostly tomato juice (which is 4.1). Original coke is 2.6; Gatorade is 2.95; Powerade is 2.75. The only alkaline drink I know of is AlkaSelzer (after the fizz is gone). Drinks with a pH of less than 5.5 are harmful to tooth enamel (but don't brush until at least 30 min after acidic drink (to allow saliva to do what realkalinizing it can). And, although *pure* water has a neutral (7.0) pH, most city tap water is slightly acidic (due to dissolved chlorine).

[Note: Remembering high school chemistry (eons ago for me), pH = negative log (base 10) of hydrogen ion concentration. So 3.0 is 10x more acidic than 4.0 and 100x more acidic than 5.0; and 4.1 is twice as acidic as 4.2.]

Remembering such relatively useless stuff as pH when I can't find my car keys or recall what I read an hour ago pisses me off. Guess I'll go meditate or take another Wellbutrin (works better for me than Ritalin--can't take both b/c of EPS).

Btw, either stims have radically different mechanisms of action or my brain is wired even more peculiarly than I realized; Ritalin makes me more alert, Adderall gives me horrible headaches, and Dexedrine Spansules put me to sleep!

Regards, medlib


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