Which of the following is an accurate method to determine the pH of an aqueous solution? Litmus Phenolphthalein Phenol red pH meter
Adv.
pH meter
Classical pH meter in chemical or clinical laboratory is made with a glass electrode that is selectively sensitive to ______ concentration. Na+ K+ H+ OH-
Calibration should be performed with at least _________buffer(s) that span of range of pH to be measured. one two three four
pH meter gives an electrical response proportional to the concentration of hydrogen ion. To convert this response into pH, glass electrode must be calibrated against standard solution of known H+ concentration. Which of the following standard solution(s) is/are likely to be used. pH 4.0 buffer pH 7.0 buffer pH 10 buffer All of the above.
After each single measurement, the probe is rinsed with ____________ to remove any trace of the solution being measured. I. Ionized water II. Distilled water III. Deionized water
I only. I and II only. II and III only. None of the above.
Permissible limit of alkalinity in drinking water is a : 50mg/l b : 300mg/l c : 20-200mg/l d : 100mg/l
Alkalinity in waste water is useful because it provides buffering to resist changes in pH value. a : True b : False
Alkalinity can also be related to hardness because of presence of a : CaCO3 b : MgCO3 c : Na2CO3 d : K2CO3
Alkalinity is important in aquatic life because a : It helps water to remain warm b : It helps water to remain cold c : It buffers against rapid pH change d : None of the above
An alkalinity test measures the level of a : Carbonates only b : Hydroxides only c : Bicarbonates, carbonates, and hydroxides d : None of the above
Higher is the alkalinity in water easier it is for pH change. a : False b : True
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