both sentences are true, (B) if both sentences are false, (C) if the first sentence is true but the second is false, and (D) if the first sentence is false but the second is true. 1. In the Winkler Titration Method, the starch solution turns colorless in the presence of free iodine in the solution to be titrated. In the Winkler Titration Method, the endpoint is determined
(A) if both sentences are true,
(B) if both sentences are false,
(C) if the first sentence is true but the second is false, and
(D) if the first sentence is false but the second is true.
1. In the Winkler Titration Method, the starch solution turns colorless in the presence of free iodine in the solution to be titrated. In the Winkler Titration Method, the endpoint is determined by the visual indicator, methyl violet.
2. Radioactive elements gain stability by single emission, and a successive emission creates a series. Half-life is the half of the amount of life that a radioactive material will continue to exist before it decays completely.
3. In collecting the tap water sample used in the experiment on dissolved oxygen determination, the container was allowed to overflow so that no bubbles will be formed inside the container that may affect the amount of DO in the water sample. In the experiment on dissolved oxygen determination, the tips of the pipettes should be well above the surface of the liquid when introducing various reagents into the full bottle of sample.
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