Question

6. Mercury (I) nitrate should have the formula HgNO3, but spectroscopic and freezing point depression studies indicate (and it is now accepted) that in fact the formula is Hg2(NO3)2 (because the mercury(1) ion is a diatomic ion Hg22). What value for i would you expect for a 1 m solution based on the formula HgNO3? What would be the / value for Hga(NO3)2? HONO: Hg2(NO3)2 7. Using salt as a de-icing substance can result in corrosion problems. Search chemical literature or other available sources to find out what other chemicals can (and are) used instead. Do they have any disadvantages? 8. What mass of NaCl you need to prepare 10 g of 1m Naci Calculations: 9. How would you prepare 10 g of 1 m Al (NO3), using AI (NO3)3 * 9 H20 as your solute. Calculations: I would dissolve g of AI (NO3)3 * 9 H2O in Lg water What, if any, assumption(s) have you made?
can you help with 6

Answer 1

Vant Hoff factor is the ratio between observed colligate property to the theoretically calculated colligative property.

Or it is ratio between observed number of particles to the theoretically calculated number of particles.

Vant Hoff factor is denoted by i

i = observed number of particles/Calculated number of particles

For HgNO_​​​3 ,

Observed number of particles = 2 ( Hg^{​​​​​2+} and NO_{​​​​​3}^{​​​​-} )

Theoretically calculated number of particles = 1

Therefore i = 2/1 = 2

For Hg_{​​​​​2}​​​​(NO_​​3 )_{2 ,}

Observed number of particles= 3 ( One Hg_{​​​​​2}^{​​​​2+} and 2 NO_{​​​​​3}^{​​​​-} ions)

Theoretically calculated number of particles = 1

Vant Hoff factor for Hg_{​​​​​2}​​​​(NO_​​3 )₂ is 3/1 = 3

i = 3/1 = 3