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ryzh [129]
4 years ago
14

Why is Tin important? Elaborate on the importance.

Chemistry
1 answer:
krok68 [10]4 years ago
5 0
Perhaps the most important use of tin, historically, has been to make bronze — an alloy of copper and tin or other metals — that changed civilization by ushering in the Bronze Age. People began making or trading for bronze tools and weapons at different times, depending on geography, but the Bronze Age is commonly accepted to have started around 3300 B.C. in the Near East.

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In a titration of nitrous acid with NaOH, the pH of the solution is 3.14 when the moles of HNO2 and the moles of NO2-- are equal
jonny [76]

Answer:

Ka=3.98x10^{-4}

Explanation:

Hello there!

In this case, since the modelling of titration problems can be approached via the Henderson-Hasselbach equation to set up a relationship between pH, pKa and the concentration of the acid and its conjugate base, we can write:

pH=pKa+log(\frac{[NO_2^-]}{[HNO_2]} )

Whereas the pH is given as 3.14 and the concentrations are the same, that is why the pH would be equal to the pKa as the logarithm gets 0 (log(1)=0); thus, we can calculate the Ka via:

Ka=10^{-pKa}=10^{-3.14}\\\\Ka=3.98x10^{-4}

Best regards!

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3 years ago
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The answer is no.

Explanation:

The surface of earth does not always stay the same as we know earth constantly moves and the surface of earth is constantly remodeled by various geological processes.

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