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4. pH Levels in Chemistry – The pH scale, which measures the acidity or basicity of a solution, is logarithmic. pH is defined as the negative logarithm of the hydrogen ion concentration in a solution. This means that each unit change in pH represents a tenfold change in hydrogen ion concentration.
LOGARITHMS PRACTICE SIMPLIFYING EXPRESSIONS. single logarithm. log 2 7 + log 2 2. log 2 20 − log 2 4. 3log 5 2 + log 5 8. 2log 6 8 − 5log 6 2. log 10 8 + log 10 5 − log 10 0.5. log 2 14 , log 2 5 , log 5 64 , log 6 2 , log 10 80. single logarithm.
The problems include evaluating logarithmic expressions, using pH formulas, solving various equations and inequalities, expressing logarithms in terms of common logarithms, and application questions about bacteria growth, acidity, sound intensity, and conditions for plant growth.
Solutions. Note: The significant figures in the concentration of [H+] or [OH -] is equal to the number of decimal places in the pH or pOH and vice versa. 1) What is the pH of a 0.0235 M HCl solution? pH = -log[H+] = -log(0.0235) = 1.629. 2) What is the pOH of a 0.0235 M HCl solution?
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LOGARITHMS AND THE pH SCALE A scientific application of Logarithms is the pH scale which is used to measure the concentration of H+ ions in an acidic or basic solution. pH is equal to the negative logarithm of the hydrogen concentration in a solution. The equation is pH= - log[H+] where [H+] represents the hydrogen
KEY. Chemistry: pH and pOH calculations. Part 1: Fill in the missing information in the table below. Part 2: For each of the problems below, assume 100% dissociation. Write the equation for the dissociation of hydrochloric acid. HCl(aq) H1+(aq) + Cl1-(aq) Find the pH of a 0.00476 M hydrochloric acid solution.
