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2 years ago

6

What is the molarity of a sodium hydroxide solution if 30.0 mL of the solution is neutralized by 26.4 mL of 0.250M hydrochloric

acid solution? All I need is the formula, thank you.

1 answer:

tiny-mole [99]2 years ago

3 0

It’s on the website i just found and it’s not letting me send it on here don’t know why text me and i we’ll send it

explain:

By the answers for it

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As the vibration of molecules increases, the _____ of the substance increases.

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Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an el

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Answer: 530 hours

Explanation:

The reduction of Nickel ions to nickel is shown as:

$Ni^{2+}+2e^-\rightarrow Ni$

$96500\times 2=193000Coloumb$ of electricity deposits 1 mole of Nickel

1 mole of Nickel weighs = 58.7 g

Given quantity = 18.0 kg = 18000 g (1kg=1000g)

58.7 g of Nickel is deposited by 193000 C of electricity

18000 g of Nickel is deposited by = $\frac{193000}{58.7}\times 18000=59182282.8C$ of electricity

$Q=I\times t$

where Q= quantity of electricity in coloumbs = 59182282.8C

I = current in amperes = 31.0 A

t= time in seconds = ?

$59182282.8C=31.0A\times t$

$t=1909105.9sec$

(1h=3600 sec)

$t=530hours$

Thus 530 hours are required to plate 18.0 kg of nickel onto the cathode if the current passed through the cell is held constant at 31.0 A

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2 years ago