Interpretation: The volume of
Concept Introduction:
Moles: One mole is equivalent to the mass of the substance consists same number of units equal to the atoms present in
From given mass of substance moles could be calculated by using the following formula,
Mass: It is the quantitative measure of a substance. The amount of matter present in substance is expressed as mass. The
Molar mass: It is obtained by dividing the mass of substance with the amount of substance and the S.I. unit of molar mass is
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Chemistry & Chemical Reactivity
- (a) Find the pH of a 1.00 L solution prepared with 12.43 g of base (CH2OH)3CNH2 (MW =121.135 g/mol) plus 4.67 g of its conjugate acid (CH2OH)3CNH3Cl (MW = 157.596 g/mol).(b) How many mL of 0.500 M NaOH should be added to 10.0 g of (CH2OH)3CNH3Cl to give a pH of 7.60in a final volume of 250 mLConsider the pKa of (CH2OH)3CNH3+ = 8.072arrow_forwardExplain the difference in the solubility of benzoic acid and sodium benzoate in water.Which of the two would you predict to be more soluble in CHCl3? Explain.arrow_forwardHEPES ((4-(2-hydroxyethyl)-1-piperazine ethane sulfonic acid) is a commonly used cell culture buffer with a pKa of 7.5. If you need to prepare 500 mL of 0.2 M HEPES, pH 6.9, how much would you need of the following stock chemicals: 1.0 M HEPES, pH 8.0; 6 M HCI; 6 M NaOH; and distilled H2O?arrow_forward
- In Aspirin lab preparation a student used 69.0 g of salicylic acid and 30.0 g of acetic anhydride. Write the general balanced equation and calculate the reaction efficiency, if the pure aspirin was 0.25 mole. Why did you use phosphoric acid in the reaction?arrow_forward3. Caffeine is an alkaloid and has base characteristics. Of the four nitrogens in the structure of the molecule, which one(s) would give it this property? sneltro benti 4. Besides caffeine, what else is extracted into the tea? Why can you use the basic salt, Na₂CO3, sodium carbonate, to remove this material? 5. What criterion is used for the purity of a sample of caffeine?arrow_forwardWhere does ammonia separate from water?arrow_forward
- An analytical chemist is titrating 50.2 mL of a 0.5100M solution of trimethylamine ((CH3)N) with a 0.7400M solution of HNO3. The pk of trimethylamine is 4.19. Calculate the pH of the base solution after the chemist has added 38.0 mL of the HNO3 solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of HNO3 solution added. Round your answer to 2 decimal places. pH = Xarrow_forward6 a) A proportion of fentanyl is known to be lost to IV infusion bags made from PVC on storage and this effect is known to be pH dependent. Explain why you believe this effect occurs and what potentially could be done to minimise loss of fentanyl to the PVC packagingarrow_forwardThe amount of tartaric acid is responsible for the tartness of wine and controls the acidity of the wine. Tartaric acid also plays a very significant role in the overall taste, feel and color of a wine. Tartaric acid is a diprotic organic acid The chemical formula for tartaric acid is C4H6O6 and its structural formula is HO2CCH(OH)CH(OH)CO2H. A 50.00 mL sample of a white dinner wine required 21.48 mL of 0.03776 M NaOH to achieve a faint pink color. Express the acidity of the wine in terms of grams of tartaric acid, H2C4H4O6 (M. M. = 150.10) per 100 mL of wine. Assume that the two acidic hydrogens are titrated at the end point. MM H2C4H4O6 = 150.10 MM NaOH = 40.00 Below is the balanced chemical equation for this titration.arrow_forward
- You tested the buffer capacity of 50 mL of a 40 X dilution of a 0.012 M Glutamic acid solution. Before you started your HCl titration, the pH of the dilution was pH 6.70. Calculate the number of nmol OH- in the 50 mL dilution before you started your titration. Please note that your dilution did not display any buffer capacity. Round your answer to four decimals.arrow_forward5. In the preparation of polyurethane, what causes the solution to foam and expand in volume?arrow_forwardCalculate the percentage of Atropine in Belladonna powder using 10.7 g sample and adding 20 mL of 0.0225N H2SO4 and back titrated with 12.5 mL of 0.0295N NaOH. Each mL of 0.02N H2SO4 is equivalent to 5.788mg of Belladona alkaloids in terms of Atropine.arrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning