I don't know what you mean by "clear". Most graduate schools ask that prospective entering students take the GRE test, which is similar to the SAT test high school students take before entering college. You don't have to "pass" it because it's not really a pass/fail kind of test.
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your unknown solution made methyl red turn yellow. it also made phenolphthalein stay clear. what rang of pH does your unknown solution have?
Applications of pH meter are primarily in the following areas: 1. hospitals 2. universities 3. pharmaceutical companies 4. research institutes or laboratories
Acidic solution: under pH=7 Low acidic solution: a clear definition don't exist; pH between 4 and 7, as an possible example.
an acid
add acid
The shock will work better if the pH was within the correct range, but get the shock in asap, then do the pH.
A typical aqueous solution containing phenolpthalein is colorless within the pH range 2 - 6.
Tap water and dilute baking soda solution
Clear, no color visible below a pH of approximately 8.0
a higher concentration of OH- ions
First thing to understand is it will NOT be clear for a 2-3 days after chlorination. This is normal - then after about a week, you test it with a pool clarity and Ph kit.