Phenobarbital is a weak acid. Its intrinsic solubility is 1g /L. Its pKa is 7.4 and...
Phenytoin is an extremely weak acid, pKa 8.3, with very poor water solubility. Solubility of the sodium salt in water is 15 g/L, and in ethanol it is 95 g/L. It is freely soluble in warm propylene glycol and it has a molecular weight of 274.3. We are going to prepare five 5 mL vials of this product. With its poor water solubility, how would you propose that the required concentration of 50 mg/mL be achieved and which and how...
please explain
LET'S THINK Phenobarbital (C12 H12 N2Os; M = 232.2g/mol) is a weak acid (pKg = 7.4) used as a sedative and anticonvulsant. This drug is insoluble in water; the concentration of saturated aqueous solutions of this compound is close to 1 g/L pH Homework Unanswered Estimate the pH of a saturated solution of phenobarbital.
A buffer solution is made by adding 1.00M weak acid (pKa=4.45) to 1.25M solution of its conjugate base to make 100 mL of buffer solution. Calculate the pH after 75.0 mL of 0.725 M strong acid has been added.
Calculate the pH of precipitation for 1% lidocaine Hal. The solubility of lidocaine (S0) is 1g/10,000mL. MW of lidocaine, a weak base, is 234 g/mol and of lidocaine Hal is 271 g/mol. pKa of lidocaine is 7.87.
Ibuprofen is a weak acid with a solubility in water of 21 mg/L and a pKa of 4.91. What is the pH of a saturated solution of ibuprofen in water? The chemical formula of ibuprofen is C13H18O2.
A buffer solution is made by adding 1.00 M weak acid (pKa = 4.45) to 1.25 M solution of its conjugate base to make 100 mL of buffer solution. Calculate the pH after 75.0 mL of 0.725 M strong acid has been added.
Calculate the volume of 0.531 mol/L propanoic acid (C2H5COOH, pKa =
4.88) that must be added to 60.0 mL of 0.450 mol/L calcium
propanoate (Ca(C2H5COO)2) to prepare a buffer solution with a pH of
5.00.
Calculate the volume of 0.531 mol/L propanoic acid (CH-COOH, PK, -4.88) that must be added to 60.0 mL of 0.450 mol/L calcium propanoate (Ca(CH.COO).) to prepare a buffer solution with a pH of 5.00. 77 mL 98 mL 136 ml 68 ml 220 mL 11...
The pka of a weak acid is useful for identification of an unknown acid because it is a constant (as long as temperature remains the same). When a weak acid is titrated with a strong base, the pka of the weak acid equals the pH at the half-equivalence point. A 0.3210 g sample of weak monoprotic acid is delivered into laboratory glassware. It will be used for titratation against 0.1254 M NaOH. If the molar mass of the weak acid...
Calculate the volume of 0.531 mol/L propanoic acid (C2H5COOH, pKa = 4.88) that must be added to 60.0 mL of 0.450 mol/L calcium propanoate (Ca(C2H5COO)2) to prepare a buffer solution with a pH of 5.00.
A 0.27 −mol sample of a weak acid with an unknown pKa was combined with 12.0 mL of 2.80 M KOH and the resulting solution was diluted to 1.500 L. The measured pH of the solution was 3.85. What is the pKa of the weak acid? Express your answer using two decimal places.