Question

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Below are some questions to keep in mind as you are conducting your investigation: 1. How will you determine the pH of the juice before and after the titration? 2. What are the characteristics of a juice (or other solution) required for a successful titration using an indicator? Week 1 Pre-Lab Organizational Questions and Activities 1. Why is it important to standardize NaOH? 2. KHP is said to be a primary standard. What is a primary standard? 3. What is the reaction that takes place between KHP and NaOH? Write out the chemical equation and balance it if necessary. Кңүл ба он 4 4. Outline a detailed plan for determining the exact concentration of the 0.01M NaOH solution you created. (Hint: Think about what you might need to change if you find a published procedure for standardization.).

Answer 1

1 How will you after the determine the PH tirration ? of the Juice before and we can check PH on pH-mele citric & ascorbic acid before Juice contain both titration cheese PH the Acid by base on PH-meler. then neutralised such as NaoH with scilable after indicator. Then After titration check PH colour change PH meter or on PH Paper 2 ] what for a are the successful characteristics titration using required of Juice indicator. Charactene stics:- D Juice must give observing endpoint by indicolor. 2] Sharpe colour change obserret. 3 It gives colour change at the exact PH. to match Acid or base being titrated 3 ] why is it important to standerdised Naoh? I] NaOH is a secondary standard. It is usually stander dised against primary standard. 23 secondary standerd conch change with the time by humidity or reactive with atmospharic oxygen. hence it is imporland to standerdised Nach

7 KHP is Standard to be said & primary standard. What is primary Ans:- A primary standard is a standard that is sufficiently accurate such that it is not calibrated by or abordinate to other standerd. They provide a reference to standerdised secondary standard, It has toplowing properties: - } High purity. 2 ] Stability 3] High equivalent weight 4) Non-Toxic , cheaply available 5 kHP reaction with Nach O 11 + II + C-ok -c-ok + H₂O + NaOH - -(-OHA 'C-ona ون Acidic hydrogen pottasium Hydrogen pthalate (KHP) o] To determine the exact conin of no.01 m Naon standerdised it with primary standard such as KHR.( molarity should be 0.01m) tesing phenriethalein indicator Repeat titration 3 timer whatever readin is calculate the concentration by formula Mivi = M2 V2 M, =conc nof kHP, Vi= volume of kHP M2= conn of Naoh, Deo volume of Naon