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A substance is a good primary standard if it:

1. has a high level of purity

2. has an accurately known composition (ie. you know its molecular formula, e.g. CO3)

3. is free of moisture

4. is stable and unaffected by air during weighing

5. is soluble in water

6. has a high molar weight to reduce percentage error in weighing

7. reacts instantaneously and completely

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14y ago

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