Question

When 40 cm3 of M/4 NaOH, 50 cm3 of M/5 HNO3 and 10 cm3 of M/2 HCl solutions are mixed and the volume is made upto 500 mL, the pH of resulting solution is
(1) 2
(2) 3
(3) 4
(4) 5
​

Answer 1

When 40 cm3 of M/4 NaOH, 50 cm3 of M/5 HNO3 and 10 cm3 of M/2 HCl solutions are mixed and the volume is made upto 500 mL, the pH of resulting solution is 4.

PH solution:

• In allure, pH (/piːˈeɪtʃ/), historically designating "potential of hydrogen" (or "capacity of hydrogen"),[1] is a scale used to designate the acidity or basicity of an liquid resolution.
• Acidic resolutions (answers accompanying taller concentrations of H+ ions) are calculated to have lower pH values than elementary or salty resolutions.
• The pH scale is mathematical and with the order reversed signifies the aggregation of hydrogen ions in the answer.[2]pH=−log⁡(H+)=−record⁡([H+]/M){\displaystyle {\ce {pH}}=-\record(a_{\ce {H+}})=-\record([{\ce {H+}}]/{\ce {M}})}place M = mol dm−3. At 25 °C (77°F), answers accompanying a pH inferior 7 are acidic, and resolutions accompanying a pH degree 7 are elementary.
• Solutions accompanying a pH of 7 at this hotness are impartial (that is have the same aggregation of H+ ions as OH− ions, that is water purified by distillation or demineralization).
• The impartial profit of the pH depends on the hotness – being inferior 7 if the temperature increases above 25 °C. The pH advantage maybe inferior 0 for very intense forceful acids, or degree 14 for very condensed strong bases.

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