Task is to prepare 50 mL each of eight standard solutions with (F-) ranging from

Question

Task is to prepare 50 mL each of eight standard solutions with (F-) ranging from 1 ppm to 100 ppm.

An outline for how to determine what the standard [Flconcentrations should be is as follows: 1. Since the eight x-values are between log(1 ppm) 0 and log(100 ppm) 2, we can divide the x-values between 0 and 8 into seven intervals so that we have eight equally spaced x- values, 2. We can then compute [FT from those x-values by taking the antilog of each of the eight x-values. Since x log[FT, it can be shown that [F 10x. For example, the first x- value is log[Fl 0, so the first standard would have [Fl 100 1 ppm. 3. Round off the [F] to a number that is convenient for solution preparation. For instance, it is much easier to prepare a 30 ppm standard than it is to prepare a 32.61 ppm standard. Once you have determined what [Fl to use for your eight standards, develop a protocol for the preparation of 50 mL each of these eight solutions from a 1000 ppm F stock solution. Experimental procedure 1. Prepare the eight [Fl standards based on the protocol that you have developed above,

Explanation / Answer

Solution:

The solution preparation as per the given data is,

x = [F-] log [F-] in ppm For 50 ml in ppm 0 0 0 0 1 0 1 50 2 0.3010 2 100 3 0.477 3 150 4 0.602 4 200 5 0.699 5 250 6 0.778 6 300 7 0.845 7 350 8 0.9031 8 400

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