Test on The pH Scale and Its Applications
The pH Scale and Its Applications: A Student Guide
Test: pH, acidity and alkalinity
20 questions
Question 1: Substances with a pH of 7 are neutral.
A. Ano
B. Ne
Explanation: The study materials state that 'Substances with a pH of 7 are neutral'.
Question 2: Universal indicator provides a more accurate measurement of pH than a pH meter.
A. Ano
B. Ne
Explanation: The study materials state that using a pH meter is a more accurate way of measuring pH, whereas universal indicator is a quicker and simpler way of estimating pH.
Question 3: Adding washing powder to sea water would cause its pH to go up.
A. Ano
B. Ne
Explanation: According to chart B, washing powder has a pH of 10 and sea water has a pH of 8. Since washing powder is more alkaline (higher pH) than sea water, adding it to sea water would increase the pH.
Question 4: Universal indicator paper is a more accurate method for measuring pH compared to using a pH meter.
A. Ano
B. Ne
Explanation: The study materials state that 'Using a pH meter like the one in photo A is a more accurate way of measuring pH. However, universal indicator, as paper or solution, is often a quicker and simpler way of estimating pH.' This indicates that a pH meter is more accurate, not the universal indicator paper.
Question 5: Søren Peder Sørensen invented the pH scale primarily to control the quality of water in marshlands near the Carlsberg brewery.
A. Ano
B. Ne
Explanation: Søren Peder Sørensen invented the pH scale in 1909 as a way of measuring how acidic the beer was, while working for the Carlsberg brewery. The text states that checking the pH of water in marshland is important environmentally, but it does not link this to Sørensen's primary motivation for inventing the pH scale.