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The indicator dinitrophenol is an acid with a $K_{\mathrm{a}}$ of $1.1 \times 10^{-4} .$ In a $1.0 \times 10^{-4}-\mathrm{M}$ solution, it is colorless in acid and yellow in base. Calculate the pH range over which it goes from 10$\%$ ionized (colorless) to 90$\%$ ionized (yellow).
4.92 and 3.00
Chemistry 102
Chapter 14
Acid-Base Equilibria
Liquids
Carleton College
University of Central Florida
University of Kentucky
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certain organic substances change color in dilute solution when hydro name on concentration reaches a particular value. These substances are called US asset based indicator, or pH indicators. The equilibrium in the solution off acid based indicator can be represented as the given given equation. Etch Ellen is a simple representation for asset base indicator. The equilibrium constant K. A expression for above reaction is return us for lewd, which gives us the value 1.1 into 10 days. Super minus four. The solution goes color less. Three yellow over range off 10% to 90%. The concentration off indicator as an asset is 1.0 into 10 day super minus five. Him on the base on as a base is 9.0 to 10 rate super minus five them the ionization constant K A for die night roof in all is 1.1 into 10 days Super minus four. The concentration off hide Roni mine in acid forms of L as in base form can be due to mind in the falling manner, substituting the given values. We can determine the concentration off x 30 positive, which is one point to entertain the super minus five. Hence, the pho solution based form can be determined by taking the negative log off Hydra only mind concentration, which gives us yet equal to 4.92 The concentration off hide, Roni Mine in asset can be calculated as shown over here. The consideration off Hydro Nia. Mine turns out to be nine point time into 10 days. Super minus four. The pH is negative. Law off. I don't mind concentration, which is 3.0 Therefore, the pH off solution in base form, it's 4.92 violin acidic form. It is three point totals.
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