Flashcards on Biology Lab Measurement Techniques
Biology Lab Measurement Techniques: Your Ultimate Guide
Tap to flip · Swipe to navigate
Laboratory measurements
10 cards
Card 1
Question: What is the purpose of measuring pH in a solution?
Answer: To find out how acidic or alkaline (basic) the solution is.
Card 2
Question: How do indicators show whether a solution is acidic or alkaline?
Answer: Indicators are dyes that change colour depending on whether they're in an acid or an alkali; you add a couple of drops to the solution.
Card 3
Question: What is the difference between a single indicator and a universal indicator?
Answer: A single indicator changes colour at a specific pH range (often abruptly), while a universal indicator is a mixture that changes colour gradually acro
Card 4
Question: How is universal indicator useful in measuring pH?
Answer: It gives a gradual colour change as pH changes, allowing an estimate of the solution's pH rather than a sudden change.
Card 5
Question: How can indicators be used in paper form to test pH?
Answer: Indicators can be soaked into paper strips; spotting a small amount of solution onto the paper will change its colour according to the solution's pH.
Card 6
Question: What colour change does litmus paper show in acidic and basic conditions?
Answer: Litmus paper turns red in acidic conditions and blue in basic (alkaline) conditions.
Card 7
Question: What can universal indicator paper tell you that litmus paper cannot?
Answer: Universal indicator paper can be used to estimate the pH value based on its colour, rather than just indicating acid or base.
Card 8
Question: When is indicator paper preferred over adding indicator to the whole solution?
Answer: When you don't want to change the colour of the entire substance, or if the substance is already coloured and might obscure the indicator's colour; al
Card 9
Question: How can you test the pH of a gas sample?
Answer: Hold a piece of damp indicator paper in the gas sample; the paper will change colour according to the pH of the gases affecting the moisture.
Card 10
Question: What is a pH probe and when is it used?
Answer: A pH probe is attached to a pH meter that gives a numerical pH reading on a digital display; it is used when an accurate pH value is required.