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Use the References to access important values if needed for this question. What is the pH...
Item 1: Question (10 pts.) What is the pH of the buffer that results when 13.4 g of NaH,PO, and 5.09 g of Na HPO4 are diluted with water to a volume of 0.912 L? (K, of H,PO4 = 6.2E-8, the molar masses of NaH,PO, and Na HPO, are 120.0 g/mol and 142.0 mol, respectively) Submit Submit and Next O: Mark this question for later review. Skip to Next →
If you need Ka values, you should use this table: Use the References to access important values if needed for this question. What is the pH of the buffer that results when 13.5 g of NaH2PO4 and 5.39 g of Na2HPO4 are diluted with water to a volume of 0.759 L? (Kof H2PO4 = 6.2E-8, the molar masses of NaH2PO4 and Na2HPO4 are 120.0 g/mol and 142.0 g/mol, respectively) 6.74 Oo oo O 6.81 O -6.74 O 7.21 O 7.68...
What is the pH of the buffer that results when 14.0 g of NaH2PO4 and 7.84 g of Na2HPO4 are diluted with water to a volume of 0.940 L? (K, of H2PO4 = 6.2E-8, the molar masses of NaH2PO4 and Na2HPO4 are 120.0 g/mol and 142.0 g/mol, respectively) 0 7.21 0 7.53 0 -6.88 O 6.96 O 6.88
pka of HCN= 9.2 References Use the References to access important values if needed for this question. Determine the pH change when 0.060 mol HI is added to 1.00 L of a buffer solution that is 0.377 M in HCN and 0.257 M in CN. pH after addition - pH before addition = pH change = Submit Answer
(Review Topics] (References) Use the References to access Important values if needed for this question. What is the molar volume of Ne gas under the conditions of temperature and pressure where its density is 0.638 g/L? L/mol Submit Answer Retry Entire Group 9 more group attempts remaining
1. Calculate the masses of the conjugate acid and base needed to prepare each of t listed in the table on the left. (pKa of H,PO 6.70) Assume the availability of the phosphate salf listed in the table on the right. Fill out the worksheet below. Show all work on separate pages for full credit. кн-РО,/К, НРО, mol NaH,PO/Na2HPO Molar mass (g Salt (0.25 M, 100 mL) (0.25 M, 100 mL) 136.09 кн, РО, K2HPO NaH,PO H2O Na,HPO 7 H2O...
Use the References to access important values if needed for this question A sample of an unknown gas is found to have a density of 2.23 g/L at a pressure of 1.15 atm and a temperature of 42°C. Assume ideal behavior. The molar mass of the unknown gas is g/mol.
References Use the References to access important values if needed for this question. A buffer solution is 0.377 M in HCN and 0.257 M in KCN . If K, for HCN is 4.0x10-10, what is the pH of this buffer solution? Submit Answer
Use the References to access important values if needed for this question. A buffer solution is made that is 0.497 Min H,CO, and 0.497 M in NaHCO, if K.for H,CO, is 4.20 x 10-7, what is the pH of the buffer solution? PH Write the net ionic equation for the reaction that occurs when 0.118 mol NaOH is added to 1.00L of the buffer solution. (Use the lowest possible coefficients. Omit states of matter.) + Submit Answer Try Another Version...
Pre-Lab Assignment Hydrogen Phosphate Buffer System This pre-lab assignment is mandatory. You will receive a zero for the experiment if the pre-lab assignment is not completed before the beginning of the lab session. 1. Calculate the masses of the conjugate acid and base needed to prepare each of the six buffer solutions listed in the table on the left. (p of H,PO,= 6.70) Assume the availability of the phosphate salts listed in the table on the right. Fill out the...