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Preparation of Hydrogen from Cold Water and Metals

Which has a h...

Question

Which has a higher ph value, a concentrated or dilute solution of hydrochloric acid?

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Solution

A dilute solution of HCl has higher pH value than concentrated HCl.

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Q. ___ has higher pH value. (Dilute HCl or Concentrated HCl)

Q. (a) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why?
(b) Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised?
(c) On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution.

Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it

p H

is a measure of the concentration of hydrogen ions in a solution. The lower the

p H

, the higher the concentration of hydrogen ions, and the more acidic a solution is. Alkaline or basic solutions have lower concentrations of hydrogen ions and a

p H

7

. Which of the following substances has the highest

p H

Q. ___ has high pH value. (Dilute HCl or Concentrated HCl)

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Preparation of Hydrogen from Cold Water and Metals

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