3 years ago

31. Adding an additional oxygen atom to 02 creates....

Chemistry

1 answer:

cricket20 [7]3 years ago

4 0

It creates chlorofluorocarbons(CFCs) also would create biooxygen but in the multiple choice it only shows the CFCs

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b) it is explanatory

Explanation:

Could be a Hallmark of a Scientific Theory: a & b

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Phenolphthalein is an indicator that turns from colorless (acidic form) to magenta (basic form) and has a pKa of 9.40. What is t

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Answer:

40:1 is the ratio of the magenta phenolphthalein concentration to the colorless phenolphthalein concentration.

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To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

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$pH=pK_a+\log(\frac{[magenta(Php)]}{[Php]})$

We are given:

$pK_a$ = negative logarithm of acid dissociation constant of phenolphthalein = 9.40

$[magenta(Php)]$ = concentration of magenta phenolphthalein

$[Php]$ = concentration of colorless phenolphthalein

pH = 11

Putting values in above equation, we get:

$11=9.40+\log(\frac{[magenta(Php)]}{[Php]})$

$\log(\frac{[magenta(Php)]}{[Php]})=11-9.40=1.6$

$\frac{[magenta(Php)]}{[Php]}=10^{1.6}=39.81 :1 \approx 40:1$

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