Which color indicates a strong alkali on universal indicator?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which color indicates a strong alkali on universal indicator?

Explanation:
Universal indicator shows a range of colors as pH changes, with higher pH indicating more alkaline conditions. Strong alkalis have a very high pH (around 12–14), and at those high pH values the indicator shifts to purple. The purple color signals a solution is a strong base with many OH− ions present. By comparison, blue can indicate a weaker alkali, green is near neutral or only mildly basic, and orange points to acidic conditions. So the color that best signifies a strong alkali is purple.

Universal indicator shows a range of colors as pH changes, with higher pH indicating more alkaline conditions. Strong alkalis have a very high pH (around 12–14), and at those high pH values the indicator shifts to purple. The purple color signals a solution is a strong base with many OH− ions present. By comparison, blue can indicate a weaker alkali, green is near neutral or only mildly basic, and orange points to acidic conditions. So the color that best signifies a strong alkali is purple.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy