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Volgvan
3 years ago
7

Why was the concern over global cooling replaced with a concern over global warming

Chemistry
1 answer:
wlad13 [49]3 years ago
6 0

Global cooling was a hypothesis of the looming cooling of the Earth's surface and atmosphere that would take place over a period of substantial glaciation.  

It emerged as a result of a drop of temperature during the period of 1940s and 1970s. After this it was realized that it is not a big threat as global warming.  

On the other hand, Global warming is the rise in overall temperature of the atmosphere which is caused by greenhouse effect that is as a result of rise in the levels of greenhouse gas emissions such as CFCs and carbon dioxide.  

Global warming is a present threat in the society world over with the rise in temperatures and climatic changes taking place, this is the reason why global warming replaced global cooling.  


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Now, volume of HNO_{3} present will be calculated as follows.

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Therefore, the total volume will be the sum of the given volumes as follows.

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or,               = 0.2991 L

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Chemical equation for this reaction is as follows.

     CH_{3}NH_{3}^{+} + H_{2}O \rightleftharpoons CH_{3}NH_{2} + H_{3}O^{+}

As,      k_{a} = \frac{k_{w}}{k_{b}}        

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Now,   [HNO_{3}] = \sqrt{k_{a}[CH_{3}NH_{3}^{+}]}

                      = \sqrt{2.29 \times 10^{-11} \times 0.283}

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Now, pH will be calculated as follows.

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Thus, we can conclude that pH at equivalence point for the given solution is 5.59.

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