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- 2 table spoon solution with 10% w/v were diluted to 1 quart with water, what be ratio strength (w/v) the dilution? explain easyA K2SO4 solution is prepared by weighing out a certain amount of the pure solid reagent,dissolving it to 500.0 mL in a volumetric flask. An aliquot was taken from this solution.of 25.00 ml and diluted to 500.0 ml. An aliquot of 5.00 was taken from this new solution anddiluted to 50.00 ml. A chemical analysis of this new solution showed a 0.100%(w/v)in K+. Calculate the weight of the pure solid K2SO4 used for the preparation of the original solution.and its concentration in each volumetric flask. The answer is 2.23x10^2gIn this problem I thought of using v/n=v/n or mv=mv, but neither get the correct answer. mv=mv yields 1.4 and v/n=v/n yields 0.4. Am I doing these calculations wrong, or am I doing the wrong type of calculation in the first place?
- The solubility of ZnS(s) in water at a certain temperature is 1.4 × 10–11 mol/L, i.e., x or the [Zn+2]=[S-2]. The value of the Ksp of ZnS isIn Fe + O2 --> Fe2O3 what is the coefficient for Fe?Q/ ture or false 1- The difference between wet and dry corrosion, in the first case it occurs in the presence of moisture and the second in its absence * 2- It is necessary to fix the names of the equipment on the illustrative curve of the industrial process * 3- The flow curves are classified according to the number of reactors and the mechanism of separation or non-separation of the products * 4- In the processes that involve the purification of raw materials and products, it is preferable to purify the raw materials by adsorption, while the products are purified by washing, stripping and absorption. 5- The amount of dissolved substances in well water differs greatly from surface water due to the difference in temperature. * 6- The biological waste has no significant effect on the efficiency of the flow, but rather its effect on the toxicity of the water used for industrial purposes. 7- Several methods are used to remove unacceptable odors from water, including chemical…
- For 0.002 mol kg-1 CaCl2 at 25 °C, use the Debye-Hückel limiting law to calculate its mean ionic activity coefficient.Table 2. Gibbs Free Energies of formation (kJ), ∆G°f, for Ions in 1M Solution and Ionic Solids Cations Cl--131.228 I--51.57 NO3--108.74 SO4-2-744.53 Ag+77.107 AgCl -109.789 -66.19 -33.41 -618.41 Calculated values of ∆G°rxn and the ∆Grxn of each box, Predicted results (ppt or no ppt).Observations (Rxn or No Rxn). S or support and R for Refute Cations Cl- I- NO3- SO4-2 Ag+ Ba+2How many mL of 1:5000 (w/v) solution of phenylmercuric acetate can bemade from 125 mL of 0.2% solution?*Note: Indicate the unit.Equivalent value of 1:5000 (w/v) in percentage strength (2 decimalplaces)=Amount of phenylmercuric acetate (Give your answer in WHOLENUMBER)=EXERCISE-ROOT-A.…..pdfA31°C
- (a) The heat evolved upon dissolution of atmospheric ozone into water is determined to be +5 kcal/mol at 298 K. Given that ozone has a Henry’s constant of 9.4 × 10−3 mol/L/atm at 298 K, determine its Henry’s constant at 273 K. Note that the definition of Henry’s constant is for the process air to water. (b) If the atmospheric ozone concentration in a polluted air is 100 ppbv, what is the concentration in equilibrium with a body of water in that region at 298 K? Note that you need to assume no losses of ozone other than absorption into waterCa2+ and CO32- are dissolved in a beaker of sea water at 298 K, resulting in formation of a CaCO3precipitate:Ca2+ (aq) + CO32- (aq) ⇋ CaCO3 (s) ΔH0 = 13.44 kJ mol-1, ΔS0 = -120 J mol-1 K-1(i) Determine the direction of spontaneity under standard state conditions.(ii) Determine ΔG when [Ca2+] = 0.01 mol dm-3 and [CO32-] = 45 μmol dm-3. The activity coefficients of Ca2+ and CO32- in sea water are 0.28 and 0.21 respectively.Show that E = +1:25 V when pH = 3.0 and the ratio [Mn2+]: [MnO4] =1: 100. Please answer ASAP