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Salts of metals can be prepared by reacting the metal with an acid to produce the salt and hydrogen - Edexcel - GCSE Chemistry - Question 2 - 2018 - Paper 1
Question 2
Salts of metals can be prepared by reacting the metal with an acid to produce the salt and hydrogen. (i) Describe the test to show the gas is hydrogen. (ii) Nickel... show full transcript
Worked Solution & Example Answer:Salts of metals can be prepared by reacting the metal with an acid to produce the salt and hydrogen - Edexcel - GCSE Chemistry - Question 2 - 2018 - Paper 1
Step 1
Step 2
Explain how the structure of a nickel atom, Ni, changes when it forms a nickel ion, Ni²⁺.
Answer
When a nickel atom, represented as Ni, forms a nickel ion (Ni²⁺), it loses two electrons. The atomic structure of nickel contains 28 electrons in its neutral state. Upon losing two electrons, it results in a positively charged nickel ion with 26 electrons. This loss of electrons occurs from the outermost shell, leading to a more stable electron configuration.
Step 3
Calculate the concentration of the solution in g dm⁻³.
Answer
To calculate the concentration, use the formula:
ext{concentration} = rac{ ext{mass of solute (g)}}{ ext{volume of solution (dm}^3 ext{)}}
First, convert the volume from cm³ to dm³:
250 cm³ = 0.250 dm³.
Now, plug in the values:
ext{concentration} = rac{23.5 ext{ g}}{0.250 ext{ dm}^3} = 94 ext{ g dm}^{-3}