Advertisements
Advertisements
प्रश्न
How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?
Advertisements
उत्तर
Volume of solute = 12 ml
Volume of solution = volume of solute + volume of solvent
Volume of solvent = volume of solution – volume of solvent = 100 – 12 = 88 ml
`"Concentration" = "Volume of solute"/"volume of solute + mass of solvent"xx 100`
`12 =12/(12 + x)xx100`
`x=88`
So, 88 ml of water will be added to 12 ml of alcohol in order to prepare a concentration 12%.
APPEARS IN
संबंधित प्रश्न
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
What are the two conditions for the interconversion of states of matter ?
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Explain why steel is used to make railway lines.
Which of the following is not an element ?
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
Define solvent.
Explain what happens when a beam of light is passed through a colloidal solution.
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Milk of Magnesia is :
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Name the process by which the various gases of the air are separated.
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
______ is a smallest particle.
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
