Go with the definition. 1M means 1 mol in 1 L of solution. So for #1, 15 mM is 0.015M so you want 0.015 mols in 1L. You only want 20 mL so you want
0.015 mols x (20 mL/1000 mL) = ? mols NaCl.
mols NaCl = grams NaCl/molar mass NaCl. You know mols and molar mass, solve for grams NaCl.
To prepare 20 mL of 15 mM NaCl, how much NaCl would you need to weigh?
2. To prepare 5 mL of 1 mM glucose, how much glucose would you need to weigh? How do you prepare
1 mL of 1 mM NaCl using the NaCl solution you prepared in (1)?
3. How do you prepare 1 mL of 10 µM glucose using the glucose solution you prepared in (2)?
So repost I am not sure if I am doing any of these right
4 answers
I get that. but what about how would you prepare 1mL of 1 mM NaCl using the NaCl solution you prepared in part 1?
You know the first one is 0.015. You want to dilute it to 0.01M. You want 1 mL of the 0.01 so
0.015 x mL = 0.01 x 1 and solve for mL of the 0.015. You may need a micropipet OR you can make up solutions and make serial dilutions.
0.015 x mL = 0.01 x 1 and solve for mL of the 0.015. You may need a micropipet OR you can make up solutions and make serial dilutions.
1M is not mole , its Molarity or amount of concentration .
please check on the definition once more .
please check on the definition once more .