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timama [110]
3 years ago
13

When using a crucible and lid, why must the crucible and lid be inspected for cracks before using?

Chemistry
2 answers:
kicyunya [14]3 years ago
7 0
If it has cracks it can shatter during heating due to temperature change.
Nana76 [90]3 years ago
3 0

Explanation:

A crucible and lid plays an important role in carrying out a reactions as they help the container or vessel to be tightly closed so the no other gases from the atmosphere can enter the vessel.

Moreover, it helps in maintaining the temperature of vessel.

Therefore, when the crucible and lid be inspected for cracks before using then it should not be used because during the reaction it is possible that it will break.

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What is the mass of KOH found in a 785 mL of a 1.43 M solution of KOH
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Molarity is defined as the ratio of number of moles to the volume of solution in litres.

The mathematical expression is given as:

Molarity = \frac{Number of moles}{volume of solution in litres}

Here, molarity is equal to 1.43 M and volume is equal to 785 mL.

Convert mL into L

As, 1 mL = 0.001 L

Thus, volume = 785\times 0.001 = 0.785 L

Rearrange the formula of molarity in terms of number of moles:

Number of moles =molarity\times volume of solution in litres

n = 1.43 M \times 0.785 L

= 1.12255 mole

Now,  Number of moles  = \frac{mass in g}{molar mass}

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1.12255 mole  = \frac{mass in g}{56.10 g/mol}

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= 62.97 g

Hence, mass of KOH = 62.97 g



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3 years ago
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