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balandron [24]
3 years ago
15

During soldering, a mixture of metals ('solder') is heated until it melts. The molten metal falls into the gaps between two piec

es of metal and freezes, joining the pieces of metal together. A 'soft solder' melts between 183 °C and 212 °C. A 'hard solder' melts between 620 °C and 680 °C. Explain the difference in melting ranges.
Chemistry
1 answer:
Pavlova-9 [17]3 years ago
4 0

Answer:

31^oC

Explanation:

Range = Highest value - Lowest value

A 'soft solder' melts between 183 °C and 212 °C.

Melting range of a 'soft solder' = 212-183=29^oC

A 'hard solder' melts between 620 °C and 680 °C.

Melting range of a 'hard solder' = 680-620=60^oC

So,

Difference in melting ranges = Melting range of a 'hard solder'  - Melting range of a 'soft solder' = 60^oC-29^oC=31^oC

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In given question Fe(HCO₃)₃ ionizes as follow,

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What is the kb of a 0.0200 m ( at equilibrium) solution of methyl amine, ch3nh2, that has a ph of 11.40?
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Explanation:


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CH₃NH₂ + H₂O ⇄ CH₃NH₃⁺ + OH⁻

2) Kb = [CH₃NH₃⁺]  [OH⁻] / [CH₃NH₂] ↔ all the spieces in equilibrium


3) From the stoichiometry [CH₃NH₃⁺] = [OH⁻]

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pOH + pOH = 14 ⇒ pOH = 14 - pH = 14 - 11.40 = 2.60

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