Dilute hydrochloric acid reacts with magnesium ribbon

(i) Mg + 2HCI →MgCl 2 + H 2 Hydrogen gas is produced. (ii) HCl + NaOH →NaCl + H 2O Neutralisation reaction (iii) 2HCl(aq) + CaCO 3(s) →CaCl 2(aq)+ H 2O + CO 2 Calcium chloride is formed. Detailed Answer: (i) Dilute hydrochloric acid reacts with magnesium to form magnesium chloride and H 2 gas is liberated. Mg(s) + 2HCl(aq) → MgCl 2 (aq) + H 2(g) (ii) sodium hydroxide is a neutralisation reaction. Sodium chloride salt and water are formed, Reaction between dilute hydrochloric acid and NaOH(aq) + HCI(aq) → NaCl(aq) + H 2O(l) (iii) Dilute hydrochloric acid dissolves the CaCO 3 and makes the shell soft. Egg shells are made of calcium carbonate, CaCO 3. CaCO 3(s) + HCI(aq) → CaCl 2 + CO 2(g) + H 2O(l) (Crushed egg shell)

Table of Contents • • • • • • • How does magnesium react with hydrochloric acid? Aims • To investigate the effect of changing the conditions on the rate of a reaction. • Magnesium reacts with dilute hydrochloric acid to produce hydrogen: • magnesium + hydrochloric acid → magnesium chloride + hydrogen. • The volume of hydrogen gas produced can be measured using a gas syringe. What happens when dilute hydrochloric acid reacts with magnesium ribbon? When magnesium ribbon reacts with hydrochloric acid, magnesium chloride will be formed and hydrogen gas is liberated. There will be a change in temperature of the test tube, slight fizzing of gas bubbles,then the magnesium ribbon will dissolve into water, leaving in blue. Why does magnesium dissolve faster in hydrochloric acid? Within a reaction containing a high concentration of acid, a collision between acid particles and magnesium atoms is very likely. The more collisions made, the quicker the reaction will take place. What happens when magnesium gets wet? When magnesium interacts with water, it will form a hydrogen gas that ignites violently due to the excessive heat and oxygen supply. When it reacts, it will burn hot enough to decrease the water molecule, which turns to a Hydrogen Gas. What is a magnesium strip? A light, silvery-white, moderately hard metallic element that in ribbon or powder form burns with a brilliant white flame. Obtained chiefly from magnesite, dolomite, and bodies of salt water, it is used in structural ...

In this reaction between a metal and an acid, there are many ways to speed up this reaction. First way is to break down the magnesium ribbon into smaller pieces, so that its surface area increases, and so more acid particles can touch more places of the magnesium ribbon, therefore speeding up the reaction. The second way is to increase the concentration of the acid. This way, more acid particles are present in a given volume, and so the frequency of collisions between magnesium atoms and hydrochloric acid molecules increase, therefore again speeding up the reaction. There are also many other ways, such as adding a catalyst if possible and increasing the temperature of the acid.