Daily Question on May 13: Please discuss the possible reasons for a low content level when analyzing hydrochloric acid
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This post was last edited by zbx on 2011-5-14 at 10:24. Please discuss the reasons for low assay values in hydrochloric acid analysis. 1) Please hide your replies; the method to do this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit your replies after posting them. 2) All participants will receive a reward (deadline: 12:00 on May 14). 3) The answer key can be seen immediately after responding. Example: The analyzed content of hydrochloric acid is lower than the actual value; reasons for this error include: 1. Inadequate skill level of the analyst, 2. The standard solution has a low concentration, 3. The sample taken is not representative, 4. Inaccurate weighing using a balance, 5. The burette is not accurate, 6. Testing was not carried out in accordance with relevant standards
Reply to 1# zbx: 1. Error in the sodium hydroxide solution; 2. The flask was not cleaned with hydrochloric acid; 3. The dripping rate of sodium hydroxide was too fast
This post was last edited by qugd on 2011-5-16 09:27. Although hydrochloric acid analysis is a routine task in everyday acid-base concentration testing, there are still many factors that can affect its accuracy. 1. The apparent concentration of the standard alkali solution is lower than its actual concentration ； 2. The standard alkaline substance is not dry enough ； 3. Excessive acidic substances are present in the indicator during the titration process ； 4. The hydrochloric acid solution being tested contains salts or other substances that react with the acid. 5. The high concentration of the hydrochloric acid solution being tested leads to volatilization losses. 6. Systematic errors in the method of operation