Question 50Which of the following values gives the number of parts per million (ppm) of NaCl in a 0.90% saline solution?A.900B.9,000C.90,000D.900,000
Question
Question 50
Which of the following values gives the number of parts per million (ppm) of NaCl in a 0.90% saline solution?
A. 900
B. 9,000
C. 90,000
D. 900,000
Solution
To answer this question, we need to understand what parts per million (ppm) means. Ppm is a way of expressing very dilute concentrations of substances. 1 ppm is equivalent to 1 milligram of something per liter (mg/l).
The question states that we have a 0.90% saline solution. This means that in every 100 parts of the solution, 0.90 parts are NaCl.
To convert this percentage to ppm, we need to understand that 1% is equivalent to 10,000 ppm (because 1% is 1 part in 100 and 1 ppm is 1 part in 1,000,000, so 1% is 10,000 times larger than 1 ppm).
Therefore, to convert 0.90% to ppm, we multiply 0.90 by 10,000.
0.90 * 10,000 = 9,000 ppm
So, the correct answer is B. 9,000.
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