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Montano1993 [528]
3 years ago
7

Daniel and Sanya are scientists. Daniel is studying whether the increasing frequency of tropical storms is affecting coastal ero

sion. Sanya is investigating whether the discharge from industrial plants has any impact on the pH concentration of freshwater swamps in the surrounding area. Which fields of science are Daniel's and Sanya's studies most closely related to?
Daniel's field of study is related to [biological, earth and space,or physical] science, and Sanya's field of study is related to [biology, chemistry, or physics].​
Chemistry
1 answer:
ella [17]3 years ago
6 0

Answer:

- Daniel- Earth and Space

- Sanya- Chemistry

Explanation:

Daniel's study field is associated with the '<u>Earth and Space</u>' as he is attempting to explore how the frequency of tropical storms(in the atmosphere) and coastal erosion(relation with land and ocean) are interconnected to each other. He studies how the two are associated and affect life on the planet.

While Sanya's field of study would be '<u>Chemistry</u>' as she aims to study the composition and constitution of substances and the changes that they undergo as a consequence of alterations in the constitution of their molecules('whether the discharge from industrial plants has any impact on the pH concentration of freshwater swamps in the surrounding area').

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What mass of potassium hypochlorite (FW-90.6 g/mol) must be added to 4.50 x 10 mL of water to give a solution with pH 10.20? [Ka
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Answer : The mass of potassium hypochlorite is, 4.1 grams.

Explanation : Given,

pH = 10.20

Volume of water = 4.50\times 10^2ml=0.45L

The decomposition of KClO  will be :

KClO\rightarrow K^++ClO^-

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pOH=-\log [OH^-]

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K_b=\frac{1.0\times 10^{-14}}{4.0\times 10^{-8}}=2.5\times 10^{-7}

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The equilibrium constant expression of the reaction  is:

K_b=\frac{[OH^-][HClO]}{[ClO^-]}

As we know that, [OH^-]=[HClO]=1.58\times 10^{-4}M

2.5\times 10^{-7}=\frac{(1.58\times 10^{-4})^2}{[ClO^-]}

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Now we have to calculate the moles of ClO^-.

\text{Moles of }ClO^-=\text{Molarity of }ClO^-\times \text{Volume of solution}

\text{Moles of }ClO^-=0.0999mole/L\times 0.45L=0.0449mole

As we know that, the number of moles of ClO^- are equal to the number of moles of KClO.

So, the number of moles of KClO = 0.0449 mole

Now we have to calculate the mass of KClO.

\text{Mass of }KClO=\text{Moles of }KClO\times \text{Molar mass of }KClO

\text{Mass of }KClO=0.0449mole\times 90.6g/mole=4.07g\approx 4.1g

Therefore, the mass of potassium hypochlorite is, 4.1 grams.

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