8 (a) The concentration of a solution can be calculated using the equation concentration of solution = mass of solid --------------------- volume of solution A student dissolved 9.25 g of ammonium chloride in water and made up the solution to a volume of 200 cm³. Use the equation to calculate the concentration of this solution in g dm³. (2) (b) Dissolving ammonium chloride in water is an endothermic process. Figure 17 shows part of the reaction profile for this process. heat energy --------------------> ammonium chloride solution ammonium chloride + water ---------------------------------------> progress of reaction Figure 17 (i) Explain how Figure 17 shows that dissolving ammonium chloride in water is an endothermic process. (2)

GCSE Edexcel Chemistry Endothermic and exothermic reactions: 8 (a) The concentration of a sol

8 (a) The concentration of a solution can be calculated using the equation concentration of solution = mass of solid --------------------- volume of solution A student dissolved 9.25 g of ammonium chloride in water and made up the solution to a volume of 200 cm³ - Edexcel - GCSE Chemistry - Question 8 - 2021 - Paper 1

Question 8

8-(a)-The-concentration-of-a-solution-can-be-calculated-using-the-equation---concentration-of-solution-=----mass-of-solid------------------------volume-of-solution---A-student-dissolved-9.25-g-of-ammonium-chloride-in-water-and-made-up-the-solution-to-a-volume-of-200-cm³-Edexcel-GCSE Chemistry-Question 8-2021-Paper 1.png

8 (a) The concentration of a solution can be calculated using the equation concentration of solution = mass of solid --------------------- volume of solution ... show full transcript

Worked Solution & Example Answer:8 (a) The concentration of a solution can be calculated using the equation concentration of solution = mass of solid --------------------- volume of solution A student dissolved 9.25 g of ammonium chloride in water and made up the solution to a volume of 200 cm³ - Edexcel - GCSE Chemistry - Question 8 - 2021 - Paper 1

Step 1

Calculate the concentration of the solution in g dm³.

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Answer

To find the concentration of the solution, we use the formula:

ext{concentration of solution} = \frac{ ext{mass of solid}}{ ext{volume of solution}}

Convert the volume from cm³ to dm³:
- Since there are 1000 cm³ in 1 dm³,
- The volume in dm³ is:
$200 ext{ cm}^3 = \frac{200}{1000} = 0.200 ext{ dm}^3$
Substitute the values into the concentration formula:
- Here, the mass of solid is 9.25 g.
$ext{concentration of solution} = \frac{9.25 ext{ g}}{0.200 ext{ dm}^3} = 46.25 ext{ g dm}^{-3}$

Therefore, the concentration of the solution is 46.25 g dm³.

Step 2

Explain how Figure 17 shows that dissolving ammonium chloride in water is an endothermic process.

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Answer

Figure 17 illustrates the reaction profile during the dissolution of ammonium chloride in water. The following points explain why the process is endothermic:

Energy Absorption: The graph shows an increase in heat energy as the reaction progresses. This indicates that the system absorbs energy from the surroundings.
Product Energy Level: The energy level of the resulting ammonium chloride solution is higher than that of the reactants (solid ammonium chloride and water). This difference suggests that energy is required for the dissolution process, confirming it as an endothermic reaction.

Calculate the concentration of the solution in g dm³.

Explain how Figure 17 shows that dissolving ammonium chloride in water is an endothermic process.

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