Why is the pH of water 7 at 25°C? Record your observations. (d) orange. The test sample solutions should be freshly prepared and the firuit juice samples should also be fresh. (a)Methyl red (a) pH increases (c) 7.8 and 6 What inference can be drawn from this? Which of the following colours would be observed? 3. Red litmus turns blue in basic and blue litmus turns red in acidic medium. The colour of the strip changed to green. (d) hydrochloric acid. Acids Bases and Salts Class 10, Summary, Explanation and Notes of Acids Bases and Salts Science Chapter 2 . 17. Use each dropper to suck the contents present in the test tubes A to F and pour a drop of each content on marked pH paper respectively. (c) NaOH is base, and base turns pH paper into blue colour. (c) Acids turn pH paper red. (a) tap water (a) Dilute hydrochloric acid (b) Dilute NaOH solution (c) Dilute ethanoic acid solution (d) Lemon juice (e) Water (f) Dilute sodium bicarbonate solution Theory pH is the measure of the hydrogen ion concentration [H +] of a solution. 13. Add 10 ml of 0.1 M HCl to Solution 2. • pH meters are calibrated using buffer solutions which have an accurately known pH. • pH = 7: The solutions having pH equal to 7 are neutral in nature. (c) pH paper is blue in base and rest are acids. 2.5 A teaspoon or small scoop. On opening the soda water bottle the dissolved CO2 comes out, would the pH of the solution increase or decrease as the gas comes out? (c) Oxalic acid solution (a) acidic How to classify the sample as acidic, basic or neutral based on the pH value. On opening the soda water bottle what will be the pH of the solution when measured after few minutes? Answer: Question 3: pH of some common substances used in daily life. Question 2: • Its pH range is above 7. (c) basic Question 4. 2. Sorensen. 29. (b) Thymol blue The colours produced by universal indicator at different pH values are given in table below. Water on ionization dissociates to form: This characteristic of the chemical depends on the release of H+or OH– ions in its aqueous solution. Solid sodium bicarbonate was placed on a strip of pH paper. 11. (d) red. Four students were asked to test the pH of four samples as shown under. For example, HCl, CH3COOH, etc. (a) They are acidic in nature. • It measures pH more accurately than indicators. CBSE Practicals for Class 10 Science Lab Manual Work SA-I List of Experiments to be performed for Summative Assessment -I during practical exams. 1. (a) lemon juice How to measure the pH of a given solution using pH paper or universal indicator solution. (c) violet (c) pH of IV is less than 1, II, III. Ph Value Experiment Class 10 CBSE. 14. 36. The liquid is most probably – • Bromothymol blue – It changes colour around the neutral range (green in neutral, yellow in slightly acidic and blue in slightly basic). • It is used in making baking powder. NCERT Solutions for Class 10 Acids Bases and Salts. (d) baking soda solution. The colour of pH paper when pH value is 7 will be green. What will be the expected change in colour of the pH … A student was given four unknown colourless samples labelled A, B, C and D. He was asked to testtheirpH with pH paper. information about pH values of some common substances. A paper impregnated with the universal indicator is used for measuring pH. Answer: 2). (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. Some important constituents of universal indicator are: • Sodium hydroxide • Thymol blue (b) sugar solution Using pH meter for measuring pH gives more accurate result. The sample could be of HCI acid Test tube B – add 2 mL of dil. Put one or two drops of hydrochloric acid on the pH paper using clean glass rod as shown in the Fig. (c) pOH = -log[OH] = -log[0.01] = -log[10-2] (a) dilute sodium bicarbonate solution 3. (d) pH is 7. • It is commonly called caustic soda and is a strong base, corrosive in nature. 20. (c) turned green and then yellow HCl and dil. pH>7. Acidic solution is represented by a value less than 7 on the pH … (a) Less than 3.5 An easy. What are the components of universal indicator? The gas present in the jar is It is defined as the negative logarithm of hydrogen ions in a solution. (b) pH decreases (c) a mixture of sodium hydroxide and sodium bicarbonate The two colours seen on the extreme ends of the pH chart are: 2.4 Distilled water. (b) highly acidic A colourless liquid sample was tested with pH paper strip. Question 11. 29. Materials Required pH is defined as negative logarithm of the hydrogen ions concentration in a solution. • Its pH range is less than 7. 7. (d) Yellow colour is given by weak acids which is present in fruits and are edible, the pH range of weak acids is between 5 to 6. A value less than 7 on the pH scale represents an acidic solution whereas basic solution has pH value more than 7. The pH solution starts out purple at a neutral pH … If a pH indicator paper is dipped in a grape juice solution, what will be the possible colour of the pH paper? Name two synthetic indicators. HCl                           red (c) a mixture of sodium hydroxide and sodium bicarbonate What do you mean by pH? . Add 10 ml of 0.1 M NaOH to the RO water, measure the new pH and record it. 15. A student placed a few drops of liquid over a portion of the blue litmus paper as shown here. Which method of measuring pH is more accurate? Important Question for Class 10 Science Acids, Bases, and Salts PDF will help you in scoring more marks.. In the Brønsted-Lowry theory, the ionization of an acid in water is viewed as a proton transfer reaction where the proton acceptor is a water molecule and hence is a Brønsted-Lowry base. He observed the following colour changes: AIM 2. Decide nature of solutions of each sampie, i.e. Keep the pH strips away from chemical fumes. The pH of dil. When the pH paper is dipped in the solution whose pH is to be found out, a colour is developed on the pH paper. 3. Remove the cap and place the pH tester into the wet soil slurry. (d) pH of IV is the highest. (d) Sodium hydroxide (NaOH): Name two plants used to obtain natural indicators. 6. 15. (d) highly basic. Filed Under: Acid Bases and Salts, Class 10 Tagged With: antacids, hydrochloric acid, pH, self defence by animals, soil pH, tooth decay About Mrs Shilpi Nagpal Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. (a) Hydrochloric acid (HCl): NaOH solution? (c) basic 39. Add 100 ml of RO water to a beaker and measure its pH. pH Value and Nature of a Solution. Clean the glass rod properly before using. RESULT/CONCLUSION The pH of the given samples by using pH paper are as follows: Question 1. (Reason: The colour of pH paper is green in neutral medium while it is red in acidic medium). He observed that the blue litmus paper turned red. The liquid sample could be that of: The colours obtained on a pH paper for a highly acidic, basic and neutral solutions respectively are (a) NaOH is a strong base. Dilute sodium hydroxide (NaOH) solution ? THEORY The pH Scale It is a scale used for measuring hydrogen ion concentration. Answer: The indicator is a chemical detector used to detect the hydrogen ions (H+) and hydroxyl ions (OH-) in a solution. But when we open it the CO2 gas is released out and concentration of acid decreases. Which statement is incorrect? These solutions turn red litmus blue. • The indicator changes its colour when the pH of the solution slightly changes.
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