Solutions and pH Chemistry

An acidic solution has a higher concentration of hydrogen ions, which corresponds to a pH value of less than 7 on the pH scale.

The pH of the solution is a measure of the replaceable hydrogen ions present in it.  The larger the value of pH, the lesser is the amount of hydrogen ions and less acidic is the solution. Hence, solution with pH 5 denotes a weak acid.   

When the concentrated solution of an acid is diluted by water then the concentration of hydrogen ion per unit volume will decrease.

The normal pH range for human arterial blood is tightly regulated between 7.35 and 7.45. Among the choices, 7.45 is the only value within the physiological range.

ANS 3.

The pH of blood is 7.4. It is slightly on the alkaline side.

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The pH of acid rain is below 5.6. Acid rain is defined as any rain with a pH value of less than 5.6.

Given pH = 9.25, pOH = 14 - 9.25 = 4.75. The concentration of OH- is 10^-4.75 moles/L. Converting this to mg/L: 10^-4.75 moles/L * 17 g/mole * 1000 mg/g = 17 * 10^-4.75 mg/L, which is approximately 0.302 mg/L.

CH₃COOH + NaOH  CH₃COONa + H₂O The salt formed is strong electrolyte. It gives large concentration of CH₃COO- (C₂H₃O₂^- ions) and Na⁺ ions.

Mass is conserved in a mixture. Adding 5 grams of mix to 100 grams of water results in a total mass of 105 grams.

Stirring increases the contact between the solute (sugar) and the solvent (water), which speeds up the rate of dissolution.

On the pH scale, which ranges from 0 to 14, a value of 7 is considered neutral. Values below 7 are acidic, and values above 7 are alkaline.