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neonofarm [45]
3 years ago
7

Currently this lab is run qualitatively asking only for whether a solution is acidic, neutral, or basic. If quantitative informa

tion was to be acquired for this experiment, what range of pHs would the universal indicator described in your lab manual be unable to distinguish?
(A) 7.6-8.0
(B) 7.0
(C) 8.0-8.6
(D) 6.0-7.6
Chemistry
1 answer:
crimeas [40]3 years ago
8 0

Answer:

The only PH range which is not covered by any of the given components of the universal indicator is 7.6-8.0

Hence the PH range 7.6-8 can't be described using universal indicator.

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In this reaction 50% of the compound decompose in 10.5 min thus, it is half life of the reaction and denoted by symbol t_{1/2}.

(a) For first order reaction, rate constant and half life time are related to each other as follows:

k=\frac{0.6932}{t_{1/2}}=\frac{0.6932}{10.5 min}=0.066 min^{-1}

Thus, rate constant of the reaction is 0.066 min^{-1}.

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k=\frac{2.303}{t_{1/2}}log\frac{[A_{0}]}{[A_{t}]}

now, 75% of the compound is decomposed, if initial concentration [A_{0} ] is 100 then concentration at time t [A_{t} ] will be 100-75=25.

Putting the values,

0.066 min^{-1}=\frac{2.303}{t}log\frac{100}{25}=\frac{2.303}{t}(0.6020)

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