12.4 Separation & Purification
1. This question has 4 part(s).
1.1. Rock salt is a mixture of sand and salt. Salt dissolves in water. Sand does not dissolve in water.
A student sepearted a sample of rock salt using this method:
Place the rock salt in a beaker.
Add 100 cm3 of cold water.
Allow the sand to settle to the bottom of the beaker.
Carefully pour the salty water into an evaporating dish.
Heat the contents of the evaporating dish with a Bunsen burner until salt crystals start to form.
Suggest one improvement to step 2 to make sure all the salt is dissolved in the water.
1.2. Step 3 produces the salty water which is used in step 4. This salty water contains very small grains of sand.
Suggest one improvement to step 4 to remove all the sand.
1.3. Another student distilled the water from the salty water using the apparatus shown.
State the name of the processes occurring at A and B.
1.4. What is the reading on the thermometer during this distillation?
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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