Question

Name the ash formed on burning of magnesium ribbon.

Answer 1

Hint : We know that the magnesium ribbon is burned in air and the ash formed is magnesium oxide. The oxides that react with water to form a base or oxides that react with an acid to form a salt are known as basic oxides.

Complete Step By Step Answer:
As we know that when magnesium ribbon is burned, the ash that is formed is magnesium oxide. Magnesium oxide is basic oxide. We must know the product of the reaction of basic oxide and water. Thus, magnesium oxide being a basic oxide reacts with water and forms a base. Magnesium oxide is a substance that is obtained on burning of magnesium. Further, we obtain another substance by mixing magnesium oxide and water. Magnesium gives up two electrons to oxygen atoms and forms this powdery white product. Basically, a chemical change happens when one chemical substance is transformed into one or more different substances. One such example is when iron becomes rust.
Moreover, these changes occur through the process of chemical reactions and the resulting substances have different properties because their atoms and molecules are arranged differently. We know that the basic solutions turn blue litmus red. Also, we know that the colour of phenolphthalein is pink in basic solutions. When magnesium ribbon is burnt in air, it combines with oxygen to form white powder magnesium oxide $MgO$ with the release of heat and light. It forms a white powder of magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. $2Mg+{{O}_{2}}\to 2MgO$
Therefore, the ash from magnesium ribbon is magnesium oxide.

Note :
Remember that the acidic solutions turn blue litmus red and give no colour with phenolphthalein. The basic solutions turn red litmus blue and give pink colour with phenolphthalein.