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Sunday, May 28, 2017

New Year 2017 teaching M1 add math/m2 add sci

A new year begins with classes in M1 Add Math and M2 Add Sci.  I asked to teach M1 to get more debaters for next year, but this year our school has three sections of M1 and M2--thus after hiring more upper Bio and Chem teachers--The G has moved down to lower school.

ASDC high lights--a traditionally difficult tournament--with National teams from various countries--older kids also, we took









Saturday, February 11, 2017

Silom Team Tennis: G/Nok vs Wat/Ying pt 2 2017



Thursday, February 9, 2017

PHS M5 hw 2/10/17

1. The concentration of either the H+ ion or the OH ion is given for four aqueous solutions at 298 KFor each solutioncalculate [H+or [OH]. State whether the solution is acidicbasicor neutral.
a. [H+] = 1.0 × 1013M

b. [OH] = 1.0 × 107M

c. [OH] = 1.0 × 103M

d. [H+] = 4.0 × 105M

2. Challenge Calculate the number of H+ ions and the number of OH ions in 300 mL of pure water at 298 K.

READING CHECKExplain why you cannot obtain the [H+directly from the molarity of weak acid solution.


1. Calculate the pH of solutions having the following ion concentrations at 298 K.
a. [H+] = 1.0 × 102M

b. [H+] = 3.0 × 106M

2. Calculate the pH of aqueous solutions with the following [H+at 298 K.
a. [H+] = 0.0055M

b. [H+] = 0.000084M

3. Challenge Calculate the pH of solution having [OH] = 8.2 × 106M.