| Sodium hydroxide is added dropwise to the aqueous solution of the unknown. Choose the concentration of NaOH and how changes are to be observed. |
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Introductory investigations: The addition of base |
| Sodium hydroxide is added dropwise to the aqueous solution of the unknown. Choose the concentration of NaOH and how changes are to be observed. |
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| Consider if the change in pH is of a sufficient magnitude to support the view that a component with buffering properties is present. | ||||||
| Could anything be concluded about the buffering effect of the unknown? | ||||||
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| Consider possible components in the unknown. | ||||
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| Does the addition of 2 M NaOH result in the formation of a basic gas? | ||||
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| Consider possible components in the unknown. | ||||
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By the dropwise addition of base to an aqueous solution the pH changes can indicate whether a buffering component is present or not. By the addition of base to an aqueous solutionen it can be found whether a basic gas can be formed or not. These methods are only relevant if the solution itself is not basic. |
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