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2 years ago

If something is a hard solid, that can dissolve in water, and has a high melting point, is it Ionic of Covalent?

Chemistry

1 answer:

34kurt2 years ago

7 0

Answer:

Ionic 

If something is a hard solid, that can dissolve in water, and has a high melting point are ionic substances, because they are hard solids due to strong electrostatic force between particles and and they have high melting points because of their strong attraction between the particles which needed more energy in order to break down and melt .....

their one property is to dissolve in water because they are generally non polar which dissolves easily in polar liquids like water.

i hope it helped you.... 

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If 45 mL of water are added to 250 mL of a 0.75 M K2SO4 solution, what will the molarity of the diluted solution be?

krok68 [10]

Answer:

$\large\boxed{\large\boxed{0.64M}}$

Explanation:

When you form a diluted solution from a mother (concentrated) solution, the moles of solute are determined by the mother solution.

The main equation is:

$Molarity=\dfrac{\text{moles of solute}}{\text{volume of the solution in liters}}$

Then, since the moles of solute is the same for both the mother solution and the diluted solution:

$\text{Molarity mother solution }\times\text{ volume mother solution}=\\\\=\text{Molarity diluted solution }\times\text{ volume diluted solution}$

Substitute and solve for the molarity of the diluted solution:

$250mL\times 0.75M=(45mL+250mL)\times M\\\\\\M=\dfrac{250mL\times 0.75M}{295mL}=0.64M$

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