CHEM 1040 Study Guide - Midterm Guide: Buffer Solution, Titration Curve, Ammonia
3 Jul 2020
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Grey version: a buffer was prepared by adding 125. 0 ml of 0. 255 m lioh to 250. 0 ml of 0. 565 m hbro(aq). Write the net ionic equation for the chemical reaction (including states) & calculate the ph of this buffer solution. Ka (hbro) = 2. 0 10 9 pka (hbro) = 8. 70. 6 /6 ph = pka + log (bro /hbro) ph = 8. 70 + log (0. 03188/0. 1093) Or ph = 8. 70 0. 5351 ph = 8. 16. [h3o +] = 6. 858 10 9 ( 2 pt for calculation of ph after reaction) 2: write the net ionic equation (including states) for the reaction that occurs when hno3 is added to a buffer solution containing ch3nh2 and ch3nh3cl. 2 pts ; 1 for each mistake: calculate the numerical value of the equilibrium constant for the above reaction. For the titration curve to the right, identify (i. e. , name) the species being titrated: Wb + sa titration pkb = 14. 0 pka = 9. 4.
