V (L) Moles NaOH M NaOH NaOH = 2. The titrations yielded an average concentration of 27.99% KHP in unknown sample. As the endpoint is approached, the color disappears more slowly, at which time you should begin add drop by drop. Moles NaOH =MNaOH … You Will Use A Weighted Amount Of KHP (a Weak Acid) To Standardize Your ~ 0.2 M NaOH Solution. Assuming That You Made Exactly 0.2 M NaOH, Calculate How Many Grams Of KHP Will React With Exactly 15 ML Of 0.2 M NaOH. Info: NAOH might be an improperly capitalized: NaOH Info: NAKP might be an improperly capitalized: NaKP Instructions and examples below may help to solve this problem You can always ask for help in the forum Instructions on balancing chemical equations: Enter an equation of a chemical reaction and click 'Balance'. With a standard deviation being 2.41 the experiment concluded with 95% confidence that the KHP concentration in the unknown sample measures between 25.58% and 30.4%. Determination of the Unknown Acid Concentration Example: HCl + NaOH → NaCl + H2O At the equivalence point: Moles HCl = Moles NaOH Known: Molarity of NaOH from Part 1 (mole/L) Volume of NaOH used in titration (ml) Volume of the unknown acid (ml) To be determined: Molarity of HCl (mole/L) Calculations: 1. References. 36.06 ml Titration of acetic acid with sodium hydroxide Data Trial 1 Trial 2 Initial volume of NaOH (mL) 5.30 ml 6.55 ml Final volume of NaOH (mL) 15.40 ml 16,45 ml. Slowly add the NaOH solution to one of your flasks of KHP while gently swirling the contents of the flask. Potassium hydrogen phthalate (KHP) is a monoprotic acid that is used to standardize NaOH. The molar mass of KHP is 204.2 g/mole. Standardization of NaOH with KHP Data Trial 1 Trial 2 Trial 3 Mass KHP used (g) 1.06 g 1.07g 1.129 Initial volume of NaOH (mL) 2.20 mL 12.50 ml 835 ml Final volume of NaOH (mL) 29.20 ml 38.50 ml. If 21.39 mL of NaOH is required to titrate 0.6422 g of KHP, what is the concentration of NaOH? Moles NaOH = Moles KHP 3. This coloration disappears with swirling. Aim To standardize a sodium hydroxide (NaOH) solution against a primary standard acid [Potassium Hydrogen Phthalate (KHP)] using phenolphthalein as indicator. 1.54g of KHP is equivalent to 0.00754 mol of KHP. Data and Calculation Standardization of Sodium Hydroxide Solution Trial 1 Estimated uncertainty of sig figs. KHC8H4O4(aq) + NaOH(aq) --> KNaC8H4O4(aq) + H2O(l). 1 Laverman, L.E. As the NaOH is added a pink color appears where the drops of the base come in contact with the solution. The molar mass of KHP is approximately 204.22 g/mol. The contents of the base come in contact with the solution Moles NaOH …... ) Moles NaOH =MNaOH … Data and Calculation Standardization of Sodium Hydroxide solution Trial 1 Estimated uncertainty of figs! 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khp naoh rxn

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