3.(12pts) What is the ratio of NH4+/NH3 for a 0.5M solution of NH4Cl at pH 9? (The pKa of NH4+ is 10.5)

A 2.0% (by mass) aqueous solution of novocainium chloride (C13 H21 CIN2O2) freezes at -0.235 °C. a Calculate the van't Hoff factor, i. - Kp (H2O) = -1.86 °C/m. i = b How many moles of ions are in the solution per mole of compound? mol ions

Number 3

None

0.03 The uv spectrum of a protein solution shows A280 nm = 0.43 and A260 nm = What is the approximate protein concentration in mg/mL?

1. What is the molality of the following solutions? a. 171.9 g of Sr(NO3)2 is dissolved in 1.44 kg of water. b. 0.883 g of K3PO4 is dissolved in 40.0 g of water. 0.250M=0.250mcl kF IL scl i80.anilio (6250 mcl 0.500M=0.500md wO IL Som

You are presented with the following prescription: Rx Drug Y 175 mg Witepsol H15 q.s. Supply 6 suppositories (using 3 g nominal moulds) When using Witepsol H15, moulds will hold 1.06 times their nominal weight. The displacement value of Drug Y in Witepsol H15 is 1.1. Calculate the mass of Witepsol H15 required to prepare this product. Give your answer to two decimal places.

2. A. If 100 mls of 0.03 M HCI is added to 400 mls of 0.5 M glycine buffer at pH 10.4, what is the resultant pH? (pK1 for Gly= 2.2, Pk2=9.4) Gly.4L X.5mol/L= .2 mol HCI.1LX.03mol/L = .003mol Glyº .02mol +.003 mol .023mol [HA] = .023/.5L =.046M, [A-] =.177/.5L = .354M pH = pka +log [A-]/[HA] pH = 9.4 +log.354/.046 = 10.3 [HCI] = [H+] = .003mol/.5L = .006M pH =2.2 Gly + H+ .18mol -.003mol .177mol end start B. What would the pH be if the same amount of HCl as in part A was added to 400 mls of water?

A polymer is made with the following fractional distribution. 0.5 20 Wi Mi (kg/mol) 0.4 40 0.1 30 a) Calculate M₁, Mw, and PI for this polymer.

21 Rx KCI Sımple syrup Cherry syrup aa ad 5 mL Sig: I tsp (15 mEg) tid. x 12 days Note: molecular weight of KCI is 74.5 A How many grams of KCI is required to fill this prescription? D. How much simple syrup in milliliters is required to prepare this prescription? (assume KCI occupies no volume) 9.5