Question

How many milliequivalents (mEq) are 900 mg CaCl2 in 100 mL solution?

Options:

	162 mEq
	122 mEq
	243 mEq
	81 mEq What is the milliosmolarity (mOsmol/L) of a 0.9% sodium chloride intravenous solution? Options: 154 mOsmol/L 462 mOsmol/L 308 mOsmol/L 616 mOsmol/L

Answer 1

How many milliequivalents (mEq) are 900 mg CaCl2 in 100 mL solution?

CaCl2 --> Ca+2 + 2Cl-

mol = mass/MW = 900/(110.98 )= 8.10

Meq = 8.1/0.1 = 81 meq

Ca+2 , Cl- , Cl- --> 3 ions

so

Meq = 3*81 = 243 meq

What is the milliosmolarity (mOsmol/L) of a 0.9% sodium chloride intravenous solution?

NAcl -> na+ + Cl-

i = 2 ions

P = i*M*R*T

0.9% -->

assume = 1 liter solution

so.

0.9/100*1000 = 9 g of NaCl

mol = mass/MW = 9/58 =0.15517 mol

If 1 L -- [Nacl] = 0.15517 M

--> 1000 = 0.15517 *1000 =155 mOsmol/L

2x ions = 308 mmol /L