You have been provided with three test tubes. One of them contains distilled water and the chmeistry two contain an acidic solution and class 10th ncert chemistry chapter 2 wr basic solution, respectively. If you are given chaptdr red litmus paper, how will you identify the contents of each test tube?
If the colour of red litmus does not change then it is acid. If the colour of red litmus changes to blue then it is base. If there is slight change in the colour of red litmus such as purple then it is distilled water. Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food.
Which gas is usually liberated when an acid reacts with a class 10th ncert chemistry chapter 2 wr Illustrate with an example. How will you test for the presence ncwrt this gas? Take few pieces of zinc granules and add 5 ml of dilute H2SO4. Shake it and pass the gas produced into a soap solution.
The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas. Metal compound A reacts with dilute hydrochloric acid to produce effervescence.
The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. For example just see the following reactions.
When alcohols and glucose are mixed with water then they do not dissolve to form ions. Hence they do not show acidic character. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? Since the process of dissolving an acid in water is exothermic, it is always recommended class 10th ncert chemistry chapter 2 wr acid should be added to water.
If it is done the other way, then it is possible that because of the large amount of heat generated, the mixture splashes out and causes burns. This means that the strength of the acid decreases.
You have two solutions, A and B. The pH of solution A is 6 and pH of class 10th ncert chemistry chapter 2 wr B is 8. Which solution has more hydrogen ion concentration? Chemkstry of this is acidic and which one is basic?
A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. However, their concentration is less as compared to the concentration of OH � ions that makes the solution basic. Under what soil condition do you think a farmer would treat chrmistry soil of his fields with quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium chpter If the soil is acidic and improper for cultivation, then to increase the basicity of soil, the farmer would treat the soil with quick lime or slaked lime or chalk.
Name the 10yh which on treatment with chlorine yields bleaching powder? Name the sodium compound which is used for softening hard water. What will happen if a solution of sodium hydrocarbonate is heated?
Give the equation of the reaction involved. When sodium hydrogen carbonate is heated then sodium carbonate and water is class 10th ncert chemistry chapter 2 wr along with the evolution of carbon dioxide gas.
A solution reacts with class 10th ncert chemistry chapter 2 wr egg-shells to give a gas that turns lime-water classs. The solution chrmistry a NaCl.
If we take 20 mL of the same solution of NaOH, the amount of HCl solution the same solution as before required xlass neutralise it will be a 4 mL. Which one of the following types of medicines is used for treating indigestion?
Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an 10yh to prove it. Two nails are fitted on a cork and are cgemistry it in a mL chemisstry. The nails are then connected to the two terminals of a 6-volt battery through a bulb and a switch. Some dilute HCl is poured in the beaker and the current is switched on. The same experiment is then performed with glucose solution and alcohol solution.
Observations: It will be observed that the bulb glows in the HCl solution and does not glow in the chemistrt solution. These ions conduct electricity in the solution resulting in the glowing of the bulb. On the other hand, the glucose solution does not dissociate into ions.
Therefore, it does not conduct electricity. Conclusion: From this activity, it can be concluded that all acids contain hydrogen but not all compounds containing hydrogen are acids. That is why, though alcohols and glucose contain hydrogen, they are not categorised as acids.
Why does distilled water not conduct electricity, whereas rain water does? Distilled water cannot conduct electricity because it does not contain ions while rain water conducts electricity as it contains ions due presence of dissolved salts in it.
Acids do not show acidic behaviour in the absence of water because the dissociation of hydrogen ions from an acid occurs in the presence of water. Which solution is a neutral?
Arrange the pH in increasing order of hydrogen-ion concentration. Equal lengths of magnesium ribbons are taken in test tubes A and B. In which test tube will the fizzing occur more vigorously and why? The fizzing will occur strongly in test tube Cbapter, in which hydrochloric acid HCl is added. Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd?
Explain your answer. The pH of chemisgry is 6. As it changes to curd, the pH will reduce because curd is acidic in nature. The acids present in it decrease the pH. A milkman adds a vlass small amount of baking soda to fresh milk. Therefore, clasd takes a longer time for the curd to set.
The Plaster of Paris should be stored in a moisture-proof container as it absorbs water from moisture and turn into hard substance Gypsum as shown in following chemical equation. A reaction in 10t an acid chapger base react with each other to give a salt and water is termed as neutralization reaction. Baking powder is a mixture of baking soda and a mild acid known as tartaric acid. When it is heated or mixed in water, it releases CO2 that makes bread or rw fluffy.
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It is used in manufacturing of nickel iron storage battery or absorbing CO2 and in soap industries. It is used in manufacturing of bleaching powder in white washing and testing of carbon dioxide gas. It is used in manufacturing of antacid or neutralization of acid in the stomach for removing Greece from cloth in dry cleaning and in cleaning window pans. It is used in as a cleaning agent and sanitizer in many household and industry cleaner. Salt are the ionic compound consisting of two parts one part carrying a positive charge cation and the negative charge anion.
It is aqueous mixture of sodium chloride and water. This process is known as Chloro alkali process. Colour and taste: It is a colour less mixture with melting point oC Solubility: It is soluble at room temperature. Action of heat: At room temperature it exists in the form of dehydrate sodium chloride.
When we heat these crystals then the water molecules come out in the form of water and a black residue of NaCl remain. Hygroscopic Nature: It is hygroscopic in nature because it absorbs moisture from the surrounding.
It makes the water milky because bleaching powder contain some un react lime which are insoluble in water and makes the water milky. It is used in Laundry for beaching washed clothes. It is used in wool making industries. NOTE: We use baking soda in bakery or in kitchen because when we add baking soda in any substance it makes the food fluffy.
Their carbon dioxide is responsible for the fluffiness of food like in cake. In bakery Baking powder is used instead of baking soda because baking powder contain mild acid like tartaric acid. It is also used in medicine as antacid. It is used in soda acid fire extinguisher.
Base which are soluble in water and produce OH- are called alkalis. All alkalis are base but all base are not alkalis. For examples A OH 3 is a base but not a alkalis. The gas evolved is hydrogen gas which is used in the hydrogenation to produce Vanaspati. Lemon juice contain citric acid. Vinegar contain acetic acid.
Vitamin C tablets contain ascorbic acid. Tamarind contains tartaric acid. Sour milk contains lactic acid. Orange contains citric acid. It is used to remove the permanent hardness of water. It is used in the manufacturing the manufacturing of number of useful Product like glass, soap, paper caustic soda etc. It is used in laboratory agent for example Its standard can be prepare to Carry out acid base titration.
All living things are very sensitive to acids and too much acid can kill cells or stop proper working of cells. Concentrated acid are very dangerous and should never be handled without protection. The following projection must be observed while dealing with acids.
Always add conc. Acid to water very slowly with continuous cooling under running water. It leads to coagulation of protein and helps in their digestion.
It gives sour taste to the food. Q30 What do you understand by the Strong and Weak acids? If you have any question, feel free to post it in the comment box below. We will get back to you at the earliest. Support: support embibe.
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