Photo AI

The sodium sulfate solution was made by dissolving 28.4g of sodium sulfate in water to make 250cm³ of solution - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2020 - Paper 1

Question icon

Question 2

The-sodium-sulfate-solution-was-made-by-dissolving-28.4g-of-sodium-sulfate-in-water-to-make-250cm³-of-solution-Edexcel-GCSE Chemistry Combined Science-Question 2-2020-Paper 1.png

The sodium sulfate solution was made by dissolving 28.4g of sodium sulfate in water to make 250cm³ of solution. Calculate the concentration of this solution in g dm... show full transcript

Worked Solution & Example Answer:The sodium sulfate solution was made by dissolving 28.4g of sodium sulfate in water to make 250cm³ of solution - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2020 - Paper 1

Step 1

Calculate the concentration in g dm⁻³

96%

114 rated

Answer

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

ext{Concentration} = rac{ ext{mass of solute (g)}}{ ext{volume of solution (dm³)}}

First, we convert the volume from cm³ to dm³:

250extcm3=0.250extdm3250 ext{ cm³} = 0.250 ext{ dm³}

Next, we plug the values into the concentration formula:

ext{Concentration} = rac{28.4 ext{ g}}{0.250 ext{ dm³}} = 113.6 ext{ g dm}^{-3}

Finally, we round to three significant figures:

extConcentration=114extgdm−3 ext{Concentration} = 114 ext{ g dm}^{-3}

Step 2

Write the formula of sodium sulfate

99%

104 rated

Answer

The formula of sodium sulfate can be derived from its constituent ions. The sodium ion is represented as Na⁺ and the sulfate ion as SO₄²⁻. Therefore, to balance the charges, the formula of sodium sulfate is:

extNa2extSO4 ext{Na}_2 ext{SO}_4

Join the GCSE students using SimpleStudy...

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

;