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skelet666 [1.2K]
3 years ago
8

While working in the chemistry lab, you dissolve 2.5g of sodium hydroxide chips into a beaker containing 50mL of water. As you p

ick up the beaker to add it to a separate solution, you notice the outside of the beaker is very warm. What explains this rise in temperature?
Chemistry
2 answers:
erma4kov [3.2K]3 years ago
5 0

Answer:

The lattice enthalpy of sodium hydroxide is less than the sum of hydration enthalpies of hydroxide ions and sodium ions.

Explanation:

Lattice enthalpy is defined as heat energy required to break 1 mole of crystal lattice.

Hydration enthalpy is defined as amount energy released when 1 mole of ions undergo hydration (surrounding of water molecules).It is always negative.

Enthalpy of solution = Lattice enthalpy + hydration enthalpy

  • If amplitude of lattice enthalpy > hydration enthalpy , enthalpy of solution will positive.Hence, solution will feel cool.
  • If magnitude Lattice enthalpy < hydration enthalpy, enthalpy of solution will negative.Hence solution will feel warm or hot.

Reaction between sodium hydroxide and water is an example of an exothermic reaction. During this process sodium hydroxide dissociates into sodium ions and hydroxide ions into the water.

The rise in temperature is due to hydration enthalpy of hydroxide ions and sodium ions is greater than that of the lattice enthalpy of the sodium hydroxide. This is the reason behind the warmth of the sodium hydroxide solution.

leva [86]3 years ago
4 0

Answer:

Energy was released when the sodium and hydroxide ions formed new bonds with the water.

Explanation:

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Molarity of solution = 1.6 M

<h3>Further explanation</h3>

Given

40 g NaOH

6 L solution

Required

Steps to solve the problem of molarity

Solution

No additional information about the question.

If you want to make the solution above, then we just need to put the existing NaOH (40 g) into 6 L of water, then do the stirring (in a warm temperature above the hot plate will speed up the NaOH dissolving process)

But if you want to know the molarity of a solution, then

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\tt mol=\dfrac{mass}{MW}

MW(molecular weight) of NaOH=

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23 + 16 + 1 = 40 g/mol

so mol NaOH :

\tt mol=\dfrac{40~g}{40~g/mol}=1~mol

  • 2. Molarity(M)

\tt M=\dfrac{n}{V}\\\\M=\dfrac{1}{6}\\\\M=0.16

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Which of the following is likely to have the lowest viscosity? hot oil room temperature oil room temperature water below room te
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What is the molarity of an aqueous solution containing 1.5 moles of calcium chloride in 2.75 L of solution? A. 0.004 M B. 0.55 M
kondor19780726 [428]

Answer:

B. 0.55 M

Explanation:

Step 1: Given data

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  • Volume of solution: 2.75 M

Step 2: Calculate the molarity of the aqueous solution

The molarity is a way to express the concentration of a solution. It is equal to the quotient between the moles of solute and the liters of solution.

M = moles of solute / liters of solution

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How much in grams, does 5.68 x 1022 formula units of potassium dichromate weigh?
Alexxx [7]

Answer:

Explanation:

The molecular formula for Potassium Dichromate is K2Cr2O7. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Potassium Dichromate, or 294.1846 grams.

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