1. A burette was rinsed with deionised water but was not rinsed with the river water sample before filling it.Consequence: The river water would be because of residual water, and the concentration of hydronium ion in the river water and the pH .2. A volumetric flask used to make the NaOH standard is filled past the mark.Consequence: The concentration of the NaOH standard would be than thought. A volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be .3. NaOH on the balance for a while before the mass is recorded. Consequence: NaOH is , meaning that it absorbs moisture from the air. The amount of NaOH is therefore than thought. The concentration of the NaOH standard would be than thought. A larger volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be .
Question
- A burette was rinsed with deionised water but was not rinsed with the river water sample before filling it.Consequence: The river water would be because of residual water, and the concentration of hydronium ion in the river water and the pH .2. A volumetric flask used to make the NaOH standard is filled past the mark.Consequence: The concentration of the NaOH standard would be than thought. A volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be .3. NaOH on the balance for a while before the mass is recorded. Consequence: NaOH is , meaning that it absorbs moisture from the air. The amount of NaOH is therefore than thought. The concentration of the NaOH standard would be than thought. A larger volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be .
Solution
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A burette was rinsed with deionised water but was not rinsed with the river water sample before filling it.
Consequence: The river water would be diluted because of residual deionised water, and the concentration of hydronium ion in the river water would decrease and the pH would increase. -
A volumetric flask used to make the NaOH standard is filled past the mark.
Consequence: The concentration of the NaOH standard would be lower than thought. A larger volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be overestimated. -
NaOH on the balance for a while before the mass is recorded.
Consequence: NaOH is hygroscopic, meaning that it absorbs moisture from the air. The amount of NaOH is therefore greater than thought. The concentration of the NaOH standard would be lower than thought. A larger volume of river water would be needed to neutralise the standard. The concentration of acid in the river water would be overestimated.
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