Question

The pH of fresh urine is about
(A) 7.1
(B) 6.0
(C) 8.4
(D) 9.9

Answer 1

Hint: The pH of fresh urine is just slightly acidic. Neither it is neutral nor too acidic, the pH value is just touching the border mark of the neutral pH value. It detects the hydrogen ion concentration in the solution.

Complete step by step answer:
The pH of fresh urine is about 6.0. The pH is slightly acidic just because of the presence of uric acid in it and also due to hydrogen ions which are released in the process of tubular secretion in the kidney. Seven is the point of neutrality on the scale by which ph is measured. The lower the pH, the greater the acidity of a solution; the higher the value of the pH, the greater the alkalinity.
So the correct answer is ‘6.0’.

Additional Information: The glomerular filtrate of blood varies from a pH of roughly 7.4 to a pH of about 6 that is typically acidified by the kidneys within the urine. The pH of urine may range from Acidic ph to the alkaline ph which is from 4.5 to 8. The kidneys maintain normal acid-base equilibrium primarily through the reabsorption of sodium and therefore the tubular secretion of hydrogen and ammonium ions. Urine becomes increasingly acidic because the amount of sodium and excess acid retained by the body increases. Alkaline urine, usually containing bicarbonate-carbonic acid buffer, is generally excreted when there's more than base or alkali within the body. The secretion of an acid or alkaline urine by the kidneys is one of the foremost important mechanisms the body uses to take care of a continuing body pH.

Note: A highly acidic urine pH occurs mostly in conditions like Acidosis, Uncontrolled diabetes. Diarrhea and also during Starvation and dehydration. Highly alkaline urine occurs in Urinary tract obstruction, Pyloric obstruction, Salicylate intoxication, and in Renal tubular acidosis.