6. If you make an ammonium phosphate (NH4 3PO) solution, will it be acidic or ba

Question

6. If you make an ammonium phosphate (NH4 3PO) solution, will it be acidic or basic? Calculate pH of 0.01 M ammonium phosphate solution. 7. The following chart shows initial reaction rate measurement for the reaction below. This reaction was performed in acidic condition (H 2+ Cl2(aq) 3+, 2Cl (aq) (aq) (aq) Experiment Fe AM ICI nH AM Rate, 00015 00045 010 1.02 x 10" 2 0.0030 0.00 010 L98X105 0.0015 0.000 010 2.01 0.0030 0.000 3.89 x 10" 00015 00045 0.05 1.97 x 10 6 0.0015 0.0045 001 9.98 x 10 a) Find out the rate law of this reaction. b) Calculate rate constant (k) of this reaction. c) Write the balanced equation of this reaction using half-reaction method. d) For experiment 1, what will be the concentration of Fe 1after 10 seconds 8. The following reaction is a reduction reaction of magnetite (Fe3O4) Fe304 (s) 2C(s, graphite) 2CO2(g) 3Fe(s) a) Calculate standard Gibbs free energy of this reaction. b) Calculate equilibrium constant (K) of this reaction c) If you start this reaction with 2.0 goff Fe304, 1.0 g of graphite and 0.010 g of Co2, calculate equilibrium concentration of CO2 and mass of Fe304 at the equilibrium. 9. Calculate pH of saturated lead (ID fluoride solution in water. 10. Thorium-230 (2 Th) undergoes alpha decay gradually. If you have 2.0g of Thorium-230, what will be the remaining thorium-230 amount after 1 year? Also, what will be the amount of Radium-226 after l year? Half- life of thorium-230 is 17.23 days l 1. The following shows reaction mechanism of NO2 reaction with CO NO2 NO2 NO3 NO Step 1 slow NO CO NO CO2 Step 2 fast a) Write the rate law of this reaction. b) If 500 torr of NO2 and 300 torr of CO were reacted, what will be the concentration of NO2 and CO2 after 3 minutes? Rate constant ofthis reaction is 1.90 x 10 /torr.s

Explanation / Answer

6. Ammonium phosphate solution will hydrolyse as:

(NH4)3PO4 + 3H2O --> 3NH4OH + H3PO4
so it is a salt of weak acid and weak base.

It will form neutral solution when dissolved in water.

So the pH of 0.01 M solution will be 7.

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