An infusion stated to contain 0.95% w/v NaCl was diluted so that its Na content could be determined by flame photometry. The following dilutions were carried out:
- 10 ml of the sample was diluted to 250 ml with water.
- 10 ml of the diluted sample was diluted to 200 ml with water. The sample was found to contain 0.74 mg/100 ml of Na. Atomic weights: Na = 23 Cl = 35.5 Calculate: The % w/v of NaCl present in the infusion The % of stated content of NaCl. The concentration in mmoles/litre of NaCl present in the infusion.