Formulas
1. This question has 4 part(s).
1.1. Cobalt(II) sulfate is used in storage batteries, electroplating baths and as an additive to soils and animal feeds.
A sample of hydrated cobalt sulfate, CoSO4•xH2O, has a relative formula mass of 173.0.
Calculate a value for 'x'.
1.2. A student completed an experiment to determine the value of 'x' in a hydrated salt.
They heated a solid sample of the salt, CoSO4.xH2O, in a crucible for 60 seconds and recorded the following set of results.
Table 2.1
Mass of empty crucible (g) | 29.22 |
|---|---|
Mass of crucible and solid before heating (g) | 32.67 |
Mass of crucible and solid after heating (g) | 32.02 |
Use the data obtained by the student in Table 2.1 to calculate a value for 'x'.
1.3. The actual value for x in CoSO4.xH2O is 7.
i) Suggest one reason for the difference between your calculated value in part (b) and the actual value.
[1]
ii) Explain how you could improve the experiment the student did, using the same equipment, to achieve a value closer to the correct value for x.
[2]
1.4. Cobalt(II) sulfate undergoes a displacement reaction with magnesium because magnesium is a more reactive metal than cobalt.
Write an ionic equation for this reaction. State symbols are not required.
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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