Tara's lab group was investigating changes in matter. They measured the properties of a liquid sample, such as its melting point, density, and boiling point. They then passed an electric current
through the liquid and observed the formation of bubbles from each of the electrical contacts. The
remaining liquid appeared unchanged and had the same properties as before the electric current
was applied. When the gases were tested, each gas had a different set of properties.
Based on these observations, what can Tara's group infer about the original liquid?
A. It was a colloid.
B. It was a pure substance.
c. It was a solution.
D. It was a suspension.

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Ответ:

0139236

30.10.2022

Chemistry

pOH of resulting solution is 0.086

Explanation:

KOH and CsOH are monoacidic strong base

Number of moles of $OH^{-}$ in 375 mL of 0.88 M of KOH = $\frac{0.88\times 375}{1000}moles$ = 0.33 moles

Number of moles of $OH^{-}$ in 496 mL of 0.76 M of CsOH = $\frac{0.76\times 496}{1000}moles$ = 0.38 moles

Total volume of mixture = (375 + 496) mL = 871 mL

Total number of moles of $OH^{-}$ in mixture = (0.33 + 0.38) moles = 0.71 moles

So, concentration of $OH^{-}$ in mixture, $[OH^{-}]$ = $\frac{0.71}{871}\times 1000M=0.82M$

Hence, $pOH=-log[OH^{-}]=-log(0.82)=0.086$

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