Normal saline, a 0.90 %/wv solution of salt NaClin water, is often used as an IV carrier fluid in hospitals.Calculate the mass of NaCl in 145. mL of this solution. Be sure your answer has a unit symbol and is rounded to the correct number of significant digits.
Question
Normal saline, a 0.90 %/wv solution of salt NaClin water, is often used as an IV carrier fluid in hospitals.Calculate the mass of NaCl in 145. mL of this solution. Be sure your answer has a unit symbol and is rounded to the correct number of significant digits.
Solution
To calculate the mass of NaCl in 145 mL of a 0.90% w/v solution, follow these steps:
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Understand that a 0.90% w/v solution means there are 0.90 grams of NaCl in every 100 mL of solution.
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Set up a proportion to find out how many grams are in 145 mL. If 0.90 grams are in 100 mL, then x grams are in 145 mL. The proportion is 0.90/100 = x/145.
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Solve for x by cross multiplying and dividing. Multiply 0.90 by 145 and then divide by 100.
x = (0.90 * 145) / 100 = 1.305 grams
So, there are approximately 1.31 grams of NaCl in 145 mL of a 0.90% w/v solution, rounded to the correct number of significant digits.
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