Save Question 9 (4 points) 9. Normal saline (NaCl) is usually formulated as 0.9%

Question

Save Question 9 (4 points) 9. Normal saline (NaCl) is usually formulated as 0.9% (0.9 g per 100 mL) or alternatively expressed as 9 grams/1000 mL or 9 g/L of solution. 9.1 What is the molar (M) concentration of sodium ions in normal saline? Use the format "0.001 M" for your answer. 9.2 What is millimolar (mM) concentrations of sodium ions in normal saline? Use the format 500 mM" for your answer 9.3 What did you divide 9 g/L by to get your answer? Include units (e-g. g/L or mol/L or mol/g) in your answer. HINTS: Molecular weight of NaCl is 58.4 g/mol. Hide hint for Question 9 Remember dimensional analysis and units (e.g. g/mol, mol/L, g/L). ved

Explanation / Answer

9.1. Molar concentration of sodium ions in a saline solution will with be the same as the molarity of NaOH as the ion to solute ratio is 1:1

Therefore molar concentration of sodium ions = (0.9 g/L /58.4 g/mol) x (1000/100 L) = 0.154 M

9.2 Molar concentration of sodium ions (in mM) = 154 mM

9.3 The amount of sodium chloride was divided by it's molecular weight (58.4 g/mol) to get the number of moles per litre.

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