Chemistry question and answers for August 28, 2023
- Q Calculate the pH at 25 C of a 0.75 M aqueous solution ofphosphoric acid (H3PO4). (Ka1, Ka2, and Ka3 for phosphoric acid are7.5*10-3, 6.25*10-8, and4.8*10-13, respectively.)
- Q a) What is the pH of a buffer solution prepared by mixing 120 mLof a 0.435 M CH3CO2H with 50 mL of a .286 MCH3CO2Na solution?CH3CO2H Ka = 1.75 x10-5b)...
- Q TLC ExperimentDiscuss the reason behind different Rf values of dye by consideringthe chemical structures of dyes,mobile, and stationary phaseAmaranth O- water Rf=0.9555Amaranth O- ethanol Rf=0.6455Amaranth O- silica gel (discuss only...
- Q 1. On page 410 in your Brown & Foote textbook, the followingreaction is shown.3-pentanol + HBr --heat--> 3-bromo-pentane (major product) +4-bromo-pentane (minor product)a. Explain how the minor product can form...
- Q ± Introduction to Solubility and the Solubility ProductConstantLearning Goal:To learn how to calculate the solubility from Kspandvice versa.Consider the following equilibrium between a solid salt and itsdissolved form (ions) in...
- Q A 1.00 mL ampule of a 0.150 M solution of naphthalene in hexaneis excited with a flash of light. The naphthalene emits 12.5 J ofenergy at an average wavelength of...
- Q 1. Friedel craft alkyation such as methylation of Nitro benzene didnot yield any either meta or ortho and para products; essentiallyno reaction occurred. However alkylation of phenol (hydroxybenzene) gave ortho...
- Q Phosphoric acid is a triprotic acid with the following pKavalues:pKa1=2.148 pKa2=7.198 pKa3=12.375You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH7.720. To do this, you choose...
- Q When using radial paper chromatography to separate ink pigments,does the least soluble or most soluble pigment travel the furthestdistance? The solvent is water.
- Q When an optical spectroscopic transition is measured, either byemission or absorption, a so-called lineshape of given intensityand frequency dependence is obtained. For any spectroscopy thereexist quantum mechanical or other basic...
- Q Balance the following equation in acidic solution using thelowest possible integers and give the coefficient of H+. MnO4-(aq)+ H2S(g) → Mn2+(aq) + HSO4-(aq)
- Q Answer the following questions:Define the following terms as used in NMR:integrationchemical shiftmagnetic equivalencesplitting (multiplicity)List the properties and all known hazards of deuteratedchloroformWhy do we use a deuterated solvent instead of...
- Q Question 5A. How many mL of 0.1 M CH3COONa must you add to 35.0 mL of 0.50M CH3COOH to make a buffer of pH 4.7? [pKa of H3COONa is 4.75]B....
- Q 1. One liter of saturatedactinium hydroxide solution contains .021 g of dissolved Ac(OH)3.Calculate Ksp for Ac(OH)3CORRECT ANS: 8.8E-16 solve and explain pls2. For a particular reaction at STP ( 298...
- Q 1.Which type of radioactive emission is analogous to an electronbeing emitted?positron, neutrons, alpha particle, gamma rays, betaparticle2. Which isotope is naturally radioactive?42H, 21H,168O, 23488Ra3. the half life of protactinium-231 is...
- Q How many grams of dipotassium succinate trihydrate(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 600.0 mL of a0.0481 M succinic acid solution to produce a pH of 5.946? Succinicacid...
- Q Quinine occurs naturally in the bark of the cinchona tree. Forcenturies, it was the only treatment for malaria. Quinine containstwo weakly basic nitrogen atoms, with Kb1=3.31 x 10^-6 andKb2=.00000000135 at...
- Q Showing each step: Use the molecular weight of Tyrosinase,128,000, to determine how many micromoles ofTyrosinase are in the tubes. Assume 5 mL of Tyrosinase is used andthat it has a...
- Q Consider the following species: Na, Mg, Cl^-1,S,Cl,Ar,Na^+(a) Order the above species in order of increasing atomic/ionicradius.(b) Order the above species in order of increasing electronaffinity
- Q The orbital potential energies for the 4s and 4p of Br are-18.65 ev and -12.49ev, respectively. Recall that the H 1s is-13.61ev. The MO diagram for HBr is not exactly...
- Q Balance the following redox reaction in acid and basic mediums:MnO4^2- + SO3^2- -> Mn^2+ + SO4^2-
- Q With work shown.7. Calculate the number of sodium atoms in 4.66 moles ofsodium.8. What is the molar mass fo a substance if 0.6502 moles of thesubstance has a mass of...
- Q An aqueous solution containing 7.22g of lead (II ) nitrate is addedto an aqueous solution containing 6.02g of potassium chloride.Enter the balanced chemical equation for this reaction. Be sure toinclude...
- Q How much PE does glucose have compared to gasoline (express as apercentage)?
- Q A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF.Calculate the pH of the solution after the addition of 0.0500 molesof solid NaOH. Assume no...
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