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8.In case of dry HCl gas, there is no presence of water and so, the dye on litmus paper cannot react with the gas. So, any dry gas will not give any change in the colour of litmus paper.
9. The concentration of hydronium ions decreases when an acid is diluted because on adding water the H+ ions of the acid and hydroxyl ions of water react to form water molecules and the concentration of hydronium ions decreases. When an acid is diluted, then the concentration of hydronium ions decreases.
10.Eating spicy foods may have your gastrointestinal tract feel the heat most. It feels like your internal body is on fire, but the capsaicin compound found in chilli activates the release of substance P, a compound that transmits pain and burning sensations.Aluminum and magnesium antacids
11.We can identify the content in each of the test tubes using red litmus paper. This can be done by noticing the colour change of the red litmus paper.
On litmus paper, few drops of the three solutions in the test tubes are added separately.
The solution which turns red litmus paper to blue contains a basic solution.
Divide the obtained blue litmus paper into two parts.
The solution from the test tube which turns blue litmus paper to red will be the acidic solution.
Solution of the test tube which do not change either red or blue litmus paper contain water
12. a) Neutralization (Titration) reaction
b)Pink colour fades because HCI acid neutralises the alkaline effect of NaOH.