pH Quiz

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Questions and Answers

What is pH and how is it measured?

pH is a measurement of the degree to which water is 'acidic' or 'basic', measured on a scale from 0 to 14, with 7 being 'neutral'. The measurement is based on the balance between H+ ions and OH- ions in the water.

What is the significance of the term 'pH'?

The 'p' in pH stands for the 'power' of the activity of the H+ ion in the water.

What does the H in 'pH' refer to and why is it denoted with a plus sign?

The H in pH refers to the element Hydrogen, specifically Hydrogen H+. The plus sign indicates that the Hydrogen is carrying a positive charge, making it a Hydrogen ion.

Explain the relationship between pH value and the concentration of ions in the water.

<p>When pH is low, there are a lot of H+ ions in the water. When pH is high, there are a lot of OH- ions in the water. At pH=7, the two ions balance each other out completely.</p> Signup and view all the answers

How does each whole pH value below 7 compare in terms of acidity?

<p>Each whole pH value below 7 is ten times more acidic than the next higher value.</p> Signup and view all the answers

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Study Notes

pH Measurement Scale

pH measures the degree of acidity or basicity of water on a scale of 0 to 14
0: strongly acidic, 14: strongly basic, 7: neutral (like pure water)

pH Term Breakdown

pH: "power" of Hydrogen (H+) ion activity in water
H+ is a Hydrogen ion with a positive charge
"p" stands for "power" of H+ ion activity

pH Scale Balance

pH is based on the balance between H+ (Hydrogen) ions and negatively charged OH- (Hydroxide) ions in water
Low pH (e.g., pH = 2): high concentration of H+ ions
High pH (e.g., pH = 13): high concentration of OH- ions
pH = 7: balance between H+ and OH- ions