SDN Members don't see this ad. (About Ads) Questions 1. What does D5 1/2 NS mean? I know that 5 % dextrose is 5 g/100 ml right? so 1/2 NS does that imply 77 meq/ 1000 ml NaCl concentration? What if it is 1/4 NS 500 ml... What is the concentration the of Na Cl then Questions 2. Sodium Chloride comes in a concentration of 4 mEq/ml. How much NaCl must you add to sterile water to make the following solutions: 1/4NS 250 ml NS 1000 ml , 1/2 NS 500 ml, 1/2 NS 1000 ml, 1/4 500 ml, NS 250 ml, NS 500 ml How do you do this problem? If someone can explain me the basic steps and show an example. How are concentrations based on volume. So for 1/4, 250 will concentration be 1/8 * (154) since 154 is normal and volume is reduced by 1/4 of 1000, so 1/4 NS???