Answers created by Stefan V.

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• A sample of a mineral contains #26.83%# #"KCl"# and #34.27%# #"MgCl"_2#. Find the percentage of chlorine in this sample?
  
• What is the number of moles in #"36 g"# of #"H"_2"O"# ?
  
• If the mole fraction of #"NaCl"# in a solution is #0.125#, what is the percent by mass of #"NaCl"#?
  
• If the percentage yield of the given reaction is #30%#, how many total moles of the gases will be produced if #8# moles of #"NaNO"_3# are initially taken?
  
• Are reviewers still featuring answers?
  
• Calculate the wavelength of Radio 4 which broadcasts on a frequency of #"198 kHz"# ?
  
• Is there financial gain in the Socratic app?
  
• Will there be an option to ask a question in the Socratic app once the Socratic website is set as "read only" in August?
  
• Would it be possible for Socratic to support LaTeX in addition to the math formatter that is already included?
  
• Will the Socratic team ever design a new badge for featured answers?
  
• Titration problem?
  
• What is the status of the Socratic app?
  
• Is there a way for me to see my most viewed answers?
  
• A question where my answer was the only one has over 60,000 views. Why is the number of students I have helped much less?
  
• What is the difference between oxygenated and deoxygenated blood?
  
• Is there any way to insert graph in comments?
  
• How many questions are asked on Socratic in a day at an average?
  
• Is there a meet-and-greet discussions thread in Socratic?
  
• I have a question. Is Socratic on amazon? Because I have it on my iphone. But it would to be easier to use it on my kindle. Thanks!
  
• Is there a possibility that we can zoom in on members' impact maps?
  
• Will other languages be included as subjects in Socratic?
  
• Adding maths formatting in a question?
  
• Is there a Socratic app on the Windows Store?
  
• What is the percent by mass of KBr if 58.2 grams are dissolved in 344 grams of water?
  
• How many grams of glucose must be added to 275 g of water in order to prepare percent by mass concentration of aqueous glucose solution 1.30% ?
  
• How many liters of 4.00 M solution can be made using exactly 100.0 grams of lithum bromide?
  
• Write a balanced molecular, complete ionic, and net ionic equation for the reaction between "HBr" and #"NaOH"# ?
  
• LaTeX/MathJax: How to format in biography and/or comments?
  
• What is the #"pH"# of a #"1.5-M"# solution of ammonia? The dissociation constant of ammonia at #25.0^@"C"# is #1.80 * 10^-5#.
  
• Calculate the mass of #"CuSO"_4 * 5"H"_2"O"# needed to prepare #"100.00 mL"# of a #"0.05000-mol/L"# solution?
  
• Old questions: quite often I'll work hard to answer a question, only to find it's from 2 years ago. I imagine that questioner isn't still waiting and checking for the answer! So, to maximise my time, how can I answer new questions over old ones?
  
• The venom of biting ants contains formic acid, #"HCOOH"#. What is the #"pH"# of a #"0.0700-M"# solution of formic acid?
  
• How many grams of KI are required to make 550.0 mL of a 1.50 M KI solution ?
  
• What is the MathJax coding system that Socratic Uses?
  
• How to describe the electrons defined by the following quantum numbers?
  
• Who has asked the most questions in Socratic?
  
• If a solution is 0.5% (w/v), how many mg/ml is that?
  
• A #"25.0-mL"# sample of #"0.150-mol L"^(-1)# acetic acid is titrated with a #"0.150-mol L"^(-1)# #"NaOH"# solution. What is the #"pH"# at the equivalence point?
  
• A #"25.0-mL"# sample of #"0.150-mol L"^(-1)# hydrofluoric acid is titrated with a #"0.150-mol L"^(-1)# #"NaOH"# solution. What is the #"pH"# after #"26.0 mL"# of base is added?
  
• How much (in #"L"#) of a #"1.2-M"# #"NaCl"# solution must be used to dilute to create #"1 L"# of a #"0.12-M"# #"NaCl"# solution?
  
• You have a #"250.0-mL"# sample of #"1.00-M"# acetic acid. Assuming no volume change, how much #"NaOH"# must be added to make the best buffer? Calculate the #"pH"# of the best buffer.
  
• Suppose you wanted a 2:25 dilution of a stock solution, but you wanted 200 ml of it. How would you make this?
  
• A particular drain cleaner contains #"NaOH"#. What is the value of #["OH"^(-)]# in a solution produced when #"15.0 g"# of #"NaOH"# dissolves in enough water to make #"375 mL"# of solution?
  
• How many formula units make up #"25.0 g"# of magnesium chloride?
  
• If an electron has a spin quantum no. of #"+1/2"# and a magnetic quantum no. of #-1#, it cannot be present in?
  
• If 5.0 g of NaOH are dissolved in water to give 250.0 g total mass of solution, what is the % concentration (w/w)?
  
• What is the #"pH"# of a #"0.49-M"# #"NaClO"# solution?
  
• What mass of a 0.337% KCN solution contains 696 mg of KCN? Thank you!
  
• How many moles of #"NaOH"# were used to neutralize 0.0220 moles of #"HCl"# if the mole ratio is #"1/1"# ?
  
• #"20.0 mL"# of glacial acetic acid (pure #"CH"_3"COOH"#) is diluted to #"1.30 L"# with water. The density of glacial acetic acid is #"1.05 g/mL"#. What is the pH of the resulting solution?
  
• Calculate the amount of heat evolved in the complete oxidation of #"8.17 g"# of #"Al"# #(M_M = "26.98 g/mol")# at #25^@"C"# and #"1 atm"# pressure?
  
• Calculate the #"pH"# of a solution when #"1 g"# of acetic acid and #"4 g"# of sodium hydroxide are dissolved in #"2 L"# of water?
  
• An electron has the following quantum number values: n = 3, l = 1, ml = 0. Which of the following notations represents the most likely location of this electron?
  
• In the production of sulfuric acid, what is the limiting reagent when #1.30# moles of #"S"# react with #8.80# moles of #"HNO"_3# ?
  
• A loaf of bread has a volume of #"2270 cm"^3# and a mass of #"454 g"#. What is the density of the bread?
  
• A buffer solution was prepared by mixing #"392 mL"# of #"0.301 M"# #"NaClO"# and #"181 mL"# of #"0.281 M"# #"HClO"#. Calculate the #"pH"# of the solution?
  
• What volume of 0.1292 M NaOH is needed to neutralize 25.00 mL of HCl of unknown concentration?
  
• The equivalent weight of metal is triple to that of oxygen. What is the ratio of weight of its oxide to that of metal?
  
• What is the molarity of a solution that contains 3.25 moles of #"KCl"# in 2.25 L of the solution?
  
• Calculate the pH during a titration when 9.54 mL of a 0.15 M HCl solution has reacted with 22.88 mL of 0.14 M NaOH?
  
• A concept that will help both the "answerers" and the "questioners." Why don't Socratic developers add a website-like format where Socratic members build a website on ways of solving problems?
  
• What is the partial pressure of #"O"_2# in air at #"1 atm"# given that #21%# of air molecules are #"O"_2# ?
  
• How many grams of silver chloride can be produced if you start with #"4.62 g"# of barium chloride?
  
• When limestone, which is principally #"CaCO"_3#, is heated, carbon dioxide and quicklime are produced by the reaction?
  
• How many water molecules are in 4.0 moles of water?
  
• What is the mass, in grams, of #1.24# moles of water, #"H"_2"O"# ?
  
• Calculate the mass of carbon dioxide that contains the same number of atoms of oxygen as present in #"1.8 g"# of water?
  
• Is there any way to send a picture of the question?
  
• Calculate the concentration of an ammonia #(M_M = "17 g/mol")# solution that is #15%# #"NH"_3# and has a density of #"0.90 g/mL"# ?
  
• Which of the following sets of quantum numbers are not permitted?
  
• What values of #m_l# are permitted for an electron with #l=3# ?
  
• A liter of air containing 1% Ar is repeatedly passed over hot Cu and hot Mg till no reduction of volume takes place. The final volume of Ar will be?
  
• What is the chemical name for #"Na"_2"O"# ?
  
• One of the chlorophylls, chlorophyll a, has four nitrogen atoms in a molecule, and the mass fraction of nitrogen is 6.27%. What is the relative molar mass of chlorophyll a?
  
• What mass of #"NaBr"# is needed to prepare #"50.00 mL"# of a #6.5%# (m/v) solution in distilled water?
  
• What are the possible values of quantum number ℓ when n =1 ?
  
• Will it ever be possible to view unanswered questions for a certain topic?
  
• What is the mass of #1.2*10^18# formula units of calcium chloride?
  
• A mixture of #2.00# moles of #"H"_2#, #3.00# moles of #"NH"_3#, #4.00# moles of #"CO"_2#, and #5.00# moles of #"N"_2# exerts a total pressure of #"800. mmHg"#. What is the partial pressure of each gas?
  
• #1.00 *10^2# #"mL"# of a #"12.4-M"# #"HCl"# solution is added to water to bring the total volume of the solution to #"0.820 L"#. What is the concentration of this new solution?
  
• If 11.08 mL of 0.1111 M NaOH were required to neutralize 25.00 mL of a monoprotic acid, what was the concentration of the acid?
  
• A spherical vessel (diameter #"= 2.00 cm"#) when empty has a mass of #"2.00 g"#. What is the greatest volume of water that can be placed in the vessel and still have the vessel float at the surface of the water?
  
• Lag or my internet? [info on the new look of the impact map]
  
• #40%# of #"PCl"_5# is not dissociated at #300^@"C"#. The reaction is carried out in a flask of #"1-L"# capacity. The value of #K_c# would be?
  
• What was the first question to be asked on socratic?
  
• What is the mole fraction of #"Na"_2"SO"_4# in a solution which is #11.5%# by weight #"Na"_2"SO"_4# ?
  
• The #K_c# for the equation shown below is #0.543# at #425^@"C"#. What is the value of #K_c# for the reverse equation?
  
• What is the pH of a solution made of 0.1 M acetic acid and 0.1 M potassium acetate to which 0.001 mol of KOH has been added?
  
• What would be the final volume of a 10.4% (m/v) solution made from 5.00 g of solute?
  
• What time does a new streak day start in Eastern Time Zone?
  
• At #627^@"C"# and #"1 atm"#, #"SO"_3# is partially dissociated into #"SO"_2"# and #"O"_2# . If the density of the equilibrium mixture is #"0.925 g/L"#, what is the degree of dissociation?
  
• The equilibrium constant for the reaction is #49#. What is the equilibrium concentration of #"HI"# if #0.500# mol #"H"_2# and #0.500# mol #"I"_2# were mixed in a #"1.00-L"# container initially?
  
• Write the probable values of #l# and #m_l# for the principal quantum number #n=3#. Why?
  
• What is the pH at the half equivalence point when 50.0 mL of 0.200 M NaOH is titrated with 0.100 M HCl? The starting pH is 13.3.
  
• If #K_p = 2.4 * 10^(-3)# for the reaction below, then what is #K_c# ?
  
• How do you convert from #"kJ/g"# to #"kJ/mol"# ?
  
• Does your karma get affected if a person likes your answer than unlikes it?
  
• The #"pH"# at one-half the equivalence point in an acid-base titration was found to be #5.67#. What is the value of #K_a# for this unknown acid?
  
• You have 2.5L of .14M salt solution, how many grams of salt would be needed to make this solution?
  
• What is a key question?
  
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