The Rule of Thumb for Neglecting the Change in the Formal

question 12

Multiple Choice

The rule of thumb for neglecting the change in the formal concentration of a weak acid or a weak base,x,during an equilibrium problem is valid:

• A)if the change in x is greater than 1% of the formal concentration.
• B)if the change in x is less than 0.1% of the formal concentration.
• C)if the change in x is equal to 0.1% of the formal concentration.
• D)if the change in x is less than 10% of the formal concentration.
• E)if the change in x is less than 1% of the formal concentration.

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