(a) What would you expect the pH of pure water to be?
(b) What colour would the universal indicator show in an aqueous solution of sugar? Why?
(c) A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?
(a) The pH of pure water is 7 as it is a neutral substance.
(b) A universal indicator shows green colour in an aqueous solution of sugar as it is neutral in nature and has a pH of 7.
(c) Universal indicator shows yellow colour at pH 3, therefore the tap water is considered a weak acid.
Related Articles
- What colour will universal indicator show if you add it to the following substances?(a) Potassium hydroxide, pH = 12 (b) Soda water, pH = 5(c) Sulphuric acid, pH = 2
- (a) What is a universal indicator? For what purpose is it used?(b) How does a universal indicator work?(c) Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to test-tube containing water?
- A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?
- A salt is dissolved in water. The pH of this salt solution was found to be 7 by measuring the pH with a universal indicator paper. The salt is most likely to be(a) Na2CO3(b) KCl(c) NH4Cl(d) CH3COONa
- Which one of the following solutions would you use to test the pH of a given sample?(1)blue litmus solution(2)red litmus solution(3) universal indicator solution(4)mixture of red and blue litmus solution
- The pH of a river water sample as measured by pH paper is found to be 6. What does it tell us about water?
- table style=width:80%">A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of the solution is less than 7
- In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below :The solution having lowest pH value is:(1) A(2) B(3) C(4)D"
- An atom has the electron structure of 2, 7.(a) What is the atomic number of this atom? (b) To which of the following would it be chemically similar? 7N, 15P, 17Cl, 18Ar (c) Why would you expect it to be similar?
- How would you obtain clear water from a sample of muddy water?
- What is the name of the indicator which can be used for testing the pH of a solution?
- What would be the colour of litmus in a solution of sodium carbonate?
- The colour of methyl orange indicator in a solution is yellow. The pH of the solution is likely to be:(a) 7 (b) Less than 7 (c) 0 (d) More than 7
- (a) What effect does the concentration of H+ (aq) ions have on the nature of a solution?(b) What effect does the concentration of OH– ions have on the nature of a solution? (c) Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar? (d) Someone put some universal indicator paper onto wet soap. The pH is 8. What does this tell you about the soap? (e) State whether a solution is acidic, alkaline or neutral if its pH is :(i) 9 (ii) 4 (iii) 7 (iv) 1 (v) 10 (vi) 3
- A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue? Lemon juiceVinegarCommon saltAn antacid
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies