Question

Table sugar is sucrose. A ___ solution has the same osmolarity as a ___ solution. |_A_|...

Table sugar is sucrose. A ___ solution has the same osmolarity as a ___ solution.

|_A_| 1Msucrose...1MNaCl
|_B_| 1Msucrose...2MNaCl
|_C_| 2Msucrose...1MNaCl
|_D_| 3Msucrose...1MNaCl

Science   Anatomy-And-Physiology   
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Answer #1

|_C_| 2Msucrose...1MNaCl

Osmolarity (osmol)= number of particles produced from dissolving the solution in water x Molarity.

Sucrose is table sugar (C6H12O6), is held by covalent bonds and hence does not ionize in water, thus when dissolved in water it forms only one particle per molecule

NaCl (sodium chloride) is an ionic compound, so when dissolvsed in water it forms two particles per molecule (Na+ and Cl-)

Osmolarity of 1M, 2M and 3M sucrose will be 1osmol, 2osmol and 3osmol respectively using above formula

Osmolarity of 1M NaCl = 2x1=2 osmol (number of particles produced are 2 and 1 is the Molarity)

Osmolarity of 2M NaCl= 2x2=4 osmol

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