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April 27, 2015

Search: Calculate the concentration of the HCl solution

Number of results: 38,908

AP Chemistry
If 252mL of 2.5molar HCl solution is added to 343 mL of 2.8 molar Ba(OH)2 solution, what will be the molarity of BaCl2 in the resulting solution?
March 3, 2014 by Anonymous

Chemistry
A saturated solution is prepared by adding excess PbI2(s) to distilled water to form 1.0L of solution at 25oC. The concentration of Pb+2 in the saturated solution is found to be 1.3*10-3 M. Calculate the Ksp for PbI2(s) in water at 25 °C R/ Kps=[Pb^2+][I^-1]^2, where, [I^-1]=2...
December 22, 2014 by Samboni

Chemistry
40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution? [Ka(CH3COOH) = 1.8 ´ 10–5]
November 9, 2010 by Kelly

chem help w/ Lab
Weight of the mustard package Sample: 3.02 (g) Weight of the mustard package Solution: 33.3 (g) Trial #1 Trial #2 Trial #3 Weight of Mustard Package Solution Delivered (g) : 1.09 .948 .909 Weight of NaOH Solution Delivered (g) : .354 .304 .269 Concentration of NaOH : 7.48e-3 (...
October 17, 2012 by Den

chemistry
Online chemistry lab preparing standards help? I was told to prepare some standard for a chemistry lab and here where the instructions: Obtain a solution of known phosphate concentration. In this lab we will use (1.e-002M) potassium dihydrogen phosphate, KH2PO4. Note the ...
July 1, 2009 by Gweedo8

Chemistry
40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution? (Ka(CH3COOH) = 1.8 × 10−5)
April 10, 2011 by Bob

Chemistry
Compound Z has a MW of 100. Your lab partner weighed 25 grams of compound Z and dissolved it in water to a final volume of 1 liter. a) What is the concentration of the solution expressed as a percentage by weight (w/v)? b) What is the concentration of the solution expressed as...
August 29, 2011 by Ty

chem
Calculate the [h3o+] and [oh-], pH and the percent dissociation for both 0.25 mol/L HCl and 0.25 mol/L HCN. 0.25 mol/L HCL [H+] = 0.25 mol/L [OH-] = 1 x 10^-14 / 0.25 = 4 x 10^-14 pH = 0.60 % dissociation = ? ( I dont know how to figure out percent dissociation) For the HCN I ...
July 23, 2009 by Lena

chemistry
What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241 8.94 9.24 8.77 9.72 9.54
May 27, 2010 by Lucinda

chemistry
A 8.00 M solution of hydrochloric acid is provided. You need to make 25.0 mL of a 0.490 M HCl solution. What volume, in mL, of the 8.00 M solution should you use?
September 27, 2011 by Bekah

Chemistry
If you have a 1255ml of a 10.55 M solution of HCl and you need to dilute the solution to 1.555 M solution; How much solvent must you add?
April 7, 2015 by Emily

Physical Sciences
I have a project practical investigation to do and I have no idea how to go about with it. The problem is: Calculate the mass of sodium hydroxide used to prepare a 0,5M NaOH solution in a 250ml volumetric flask. Determine the concentration of the acetic acid solution used (...
August 10, 2012 by Cindy

chemistry please step by step for me
what volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen I know this calculate this part, but I do not get the answer 333.3ml 1.2g/ml x 1000 x 0.365/36.5 = 12M or other ...
July 4, 2014 by ken

chemistry
Equal volumes of 0.220 M weak base (Kb=4.0x10^-9) and 0.220 M HCl are mixed. Calculate the pH of the resulting solution
October 13, 2014 by Mizuhara

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 11 grams of zinc according to the following equation? ? HCl + ? Zn ! ? ZnCl2 + ? H2 Answer in units of mL
September 19, 2012 by cheri

college
1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of HCL? 2) Sodium ...
October 4, 2010 by Ashley

Chemistry
1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of HCL? 2) Sodium ...
October 4, 2010 by Ashley

college cemistry
What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241 8.94 9.24 8.77 9.72 9.54
May 27, 2010 by Lucinda

Chemistry
What is the Ph for the solution made from 11.10mL of 0.278M HCL solution mixed with 70.90mL of 0.1300M ammonia solution? The pKa for NH4 is 9.241.
May 29, 2011 by Lucy

ap chemistry
If 310mL of 2.2molar HCl solution is added to 135 mL of 3.6 molar Ba(OH)2 solution, what will be the molarity of BaCl2 in the resulting solution? Answer in units of M
March 6, 2013 by cheri

chemistry
calculate the ph of a solution by addition of 0.1 mL of 0.5m hcl to 50.0 ml pure water. I'm supposed to use c1v1=c2v2... but I did 0.1/50ml=0.002.... 0.002x0.5.. then -log the answer and got 3 for a ph is it right?
March 10, 2011 by Jeanine

General Chemistry-Acids/Bases
I'm stuck on a couple of similar problems involving pH and acids/bases 1) What is the final pH of a 1L solution that is initially .15 M HF and .2 M NaF after 10 mL of .02 M HCl has been added? Ka=7.2x10^-4 Do i just calculate the total mols of H and divide by the volume, then ...
November 26, 2008 by Evelyn

Chemistry revision
all these questions I got wrong on my homework today ...I'm trying to find out why and what the correct answers were .. please help How many grams of solute are required to make a 504 mL solution of copper (I) nitrate with a concentration of 1.3317 M? before I had help and was...
April 29, 2013 by Tif

chemistry
A chemist must dilute of M aqueous magnesium fluoride solution until the concentration falls to M . He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters
December 3, 2012 by jay

Chemistry
Question: how do you dilute something with a huge concentration to the same thing with a smaller concentration? For example: How do you dilute a 36 M solution of NaOH to a 6 M solution of NaOH?
September 2, 2014 by K

chemistry
11.During an acid-base titration, 25 mL of NaOH 0.2 M were required to neutralize 20 mL of HCl. Calculate the pH of the solution for each of the following: 12.Before the titration. 13.After adding 24.9 mL of NaOH. 14.At the equivalence point. 15.After adding 25.1 mL of NaOH. ...
May 8, 2013 by Tina

Chemistry 114
Write the balanced ionic equations for the following precipitations and complex forming reactions: a) AgNO3 solution + copper sulphate solution b) copper sulphate solution + lead nitrate solution c)CoCl2 solution + conc. HCl d) Zinc chloride solution + NaOH solution, added ...
April 12, 2010 by Chenny

Chemistry
The pH of a weak monoprotic acid, HA, is 4.55. It took 39.22 ml of 0.2334 M NaOH to titrate 25.00 ml of the acid. a. Write an equation for the above reaction. b. Calculate the molarity of the weak acid c. Write the equilibrium equation. Construct a table showing initial ...
April 9, 2011 by Cassie

Biochemistry
A buffer solution is prepared by mixing 2.50 mL of 2.00M sodium acetate with 3.30mL of 0.500M HCl and diluting the buffer with water to a final volume of 500.0mL. pK acetic acid: 4.76 what is ph of buffer? what is final concentration of buffer?
February 4, 2014 by Maria

Chemistry
Calculate mole solute in solution? I added an amount of an unknown sample to a solution. I found that the molality of the solution is 0.085m and there is 0.0156kg of solvent. Calculate the moles of solute present in solution? Thanks!
September 8, 2012 by Jones

Chemistry
Calculate mole solute in solution? I added 0.2968g of an unknown to a solution. I found that the molality of the solution is 0.085m and there is 0.0156kg of solvent. Calculate the moles of solute present in solution? Thanks!
September 8, 2012 by Jones

biochem
If I am given a solid chemical form of both the acid and the base, how do I determine how many grams of each I need to make 1L of a 25mM Tris-HCl buffer with acid concentration of 18.94mM, and base concentration of 6.06mM?
February 17, 2011 by Jenny

Chemistry
I was asked to consider the solubility for hydrated calcium sulfate in HCl. The principal acid my proffesor had posted for the solution was [ CaSO4(hyrdrated) + HCl <--> H30^+ + Ca^2+ + SO4^2- ]. I guess what I'm asking is what happened to the Cl^- and why isn't it ...
June 17, 2007 by john peterson

Chemistry (check)
Not sure if these are right 1) What is the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol if 5.00 moles of HCl(aq) (acid) neutralized 5.00 moles of NaOH(aq) (base) and released 13093 J of heat? 13093/5= 2618.6 then convert to kj 2) Calculate the Molar Enthalpy of ...
June 30, 2013 by Mary

chemistry
What is the pH of the solution created by combining 11.50 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values for HCl and HC2H302 if you take into account that the 8.00 mL of 0.10 M Acid was first diluted...
May 2, 2008 by Trisha

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
October 28, 2013 by Anonymous

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
October 28, 2013 by Anonymous

chemistry 30 concentration of a product
calculate the concentration of the products of the following equilibrium when the equilibrium constant is 12.3 and the equilibrium concentration of nobr2 is 2.17 mol/l
November 6, 2012 by Tara

Physical Chem
A student added solid K2O to a 750.0 mL volumetric flask. The solid was dissolved in water and then the flask filled with water to the mark. This formed 750.0 mL of the initial KOH solution. 20.0 mL of the initial solution was transferred to another flask and diluted to 200.0 ...
May 27, 2010 by Sara

chemistry
A solution of fructose, C6H12O6, a sugar found in many fruits, is made by dissolving 22.0 g of fructose in 1.00 kg of water. What is the molal concentration of fructose the solution? What is the mole fraction of fructose in the solution? What is the mass percent of fructose in...
March 13, 2015 by Anonymous

chemistry
Please help. Concentrated hydrochloric acid is a 38% w/w solution of HCL in water and has a density of 1.18g/ml. How many millilitres of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 w/v HCL solution? My answer is 2.12ml. I'm not sure if its correct. ...
May 7, 2012 by Peter

science
Please help. Concentrated hydrochloric acid is a 38% w/w solution of HCL in water and has a density of 1.18g/ml. How many millilitres of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 w/v HCL solution? My answer is 2.12ml. I'm not sure if its correct. ...
May 9, 2012 by Peter

chemistry
You want to measure the CaCo3 contents in chalk. To this end, you grind a piece of chalk, dissolve the slurry to make 10ml of solution and drive the carbonate out by adding 10 ml of 2M HCl. You titrate the remaining HCl back with 0.1M potassium hydroxide solution, of which you...
November 16, 2010 by Anonymous

Chemistry
Identification of an unknown powdered metal by reaction with HCl: Why does the pH of the HCl solution initially increase very slowly when an unknown metal is first added to the acid solution, but gradually increase at a faster rate as the reaction proceeds to completion?
October 6, 2013 by Ali

Biology Lab
Can you please show me how to answer this question using C1V1=C2V2 A scientist receives a vial containing a protein at at concentration of 35mg/ml and is asked to add 0.25ml of it to 6.75mls of Biuret solution. What is the concentration of protein in the Biuret solution in mg/ml?
June 17, 2012 by Mandy

CHEMISTRY
THE FOLLOWING SOLUTIONS AREMIXED TOGETHER: 121mL OF 1.54 M AgNO3 AND 45mL OF 1.07 M K2SO4 CALCULATE THE MOLAR CONCENTRATION OF Ag+ IONS IN THE FINAL SOLUTION
September 26, 2010 by KELLY

Chemistry
What is the concentration of ammonia in a solution that is .500 M NH4Cl and in which the solubility of Mg(OH)2 is 1.0x10^-3 M? Ksp for Mg(OH)2 is 6.3x10^-10. Write the equilibrium equation and calculate the overall K.
November 18, 2010 by Anonymous

chemistry
Help! The concentration of a solution of hydrochloric acid is 1•00 ± 0•05 mol dm−3 and the volume is 10•0 ± 0•1 cm3. Calculate the number of moles and state the absolute uncertainty.
June 1, 2011 by Maya

Chemistry
Analytical Chemistry question: Find the pH and the concentration of each species of lysine in a solution of 0.0010 M lysine*HCL. I know that the pKAs of lysine are (1.77)(CO2H) 9.07 (-NH3) 10.82 ( -NH3) but I am not sure where to go from there.
September 2, 2014 by chemistrysally

chemistry
titration question: How many moles of HCl must have been present in the 25mL of HCl solution in the 2 trials? Given: Trial 1: V of HCl= 25.00mL, V of NaOH used=29.50mL and M of NaOH=0.18M Trial 2: V of HCl=25.00mL, V of NaOH used=28.50mL and M of NaOH=0.18M
October 28, 2013 by robyn

Chemistry
What is the molarity of the resulting saline solution when you mix 1 mole HCl with 1 mole NaOH? I'll provide some basic information that I know, but could somebody tell me how to get the answer using the data? The balanced reaction is as follows: HCl+NaOH->H2O+NaCl Molar ...
March 8, 2008 by Andrew

Chem
Calculate the concentration of NH4+ from ammonium chloride required to prevent the precipitation of Ca(OH)2 in a liter of solution that contains .10 mol of ammonia ans .10 mol pf calcium ion. I got the two equations but I do not know where to begin. The question asks for (NH4...
May 7, 2007 by Anonymous

chemistry
Calculate the PH concentrated hydrochloric acid if this solution is 24.8% HCL by weight and has a density of 1.16g/ml. I do not understand the right answer 0.90PH Why? Please help My calculation 1.18g/ml x 1000ml x 0.248/36.5 = 7.8M I cannot do?
July 29, 2012 by Fai

Chemistry
Can someone please tell me if I did this correctly? Calculate the molarity of the HCl from the volumes of acid and base and the molarity of the NaOH. Use the following equation: (molarity of acid)x(volume of acid)=(molarity of base)x(volume of added base) equivalance point=...
February 20, 2008 by Brad

CHemistry Please Help. DR. BOBB
Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately “weighing by difference” about 0.1 g of KIO3 and placing it in your 100 mL volumetric flask. Fill the flask to mark with distilled water. Potassium iodate reacts ...
October 19, 2008 by Sara

chemistry
Expressing concentration in units of μg/mL or mg/mL are common in biochemistry, where accurate molecular weights of biomolecules are not always known. The plot below is the standard curve of a Bradford assay, a colorimetric method used to determine the concentration of ...
September 17, 2013 by Libbie

Chemistry
You are given a compound with an unknown concentration and you have five samples with known concentration of the compound. List 3 pieces of information you need to determine in order to calculate the unknown concentration spectrophotometrically.
March 4, 2013 by Anonymous

Chemistry
In this experiment absorption spectroscopy is conducted to detect Cr(VI)in aqueous solutions and with it the concentration of Cr(VI). How would each of the following affect the Cr(VI) concentration determined in this experiment? Explain the answer. 1. A student adds more ...
February 23, 2014 by Sandy

Chemistry
1 g of acid was mixed with 120 ml of distilled water and the solution was filtered into a clean dry beaker. A 25 ml aliquot of this solution was titrated with 0.1120 M NaOH. The pH of the acid was recorded to be 4.42. Calculate the initial concentration of the weak acid and ...
March 25, 2013 by Annie

Chemistry
One commercial method used to peel potatoes is to soak them in a solution of NaOH for a short time, remove them from the NaOH, and spray off the peel. The concentration of NaOH is normally in the range of 3 to 6 M. The NaOH is analyzed periodically. In one such analysis, 45.7 ...
January 12, 2011 by Chin

CHEM
In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 47.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 °C when reverse osmosis stops? Mc=? ...
February 19, 2012 by JSJFJF

DR.BOB HELP CHEMISTRY!
How many milliliters of a 0.3 molar HCl solution are needed to react completely with 8 grams of zinc according to the following equation? ? HCl + ? Zn → ? ZnCl2 + ? H2 Answer in units of mL
October 4, 2011 by Rara

chemistry
dry gaseous hcl contained in volume of 1L at STP is dissolved in 200ml of 0.5M barium hydroxide soltion. How many mol of 0.5M hcl would be needed to neutralise the resulting solution?
April 2, 2012 by mob

Chem
There are three questions in particular that I am having problems with. Here they are 1. A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard ...
January 19, 2009 by Mark

Chemistry
Calculate the molarity of the HCl from the volumes of acid and base and the molarity of the NaOH. Use the following equation: (molarity of acid)x(volume of acid)=(molarity of base)x(volume of added base) equivalance point=number of mL of base to an acid 1mL=0.001L HCl volume=...
February 20, 2008 by Brad

Chemistry
Wilh this form a buffer? 50 mL of .10 M HCl; 35 mL of .150 M NaOH WORK: Moles of HCl= .005 Moles of NaOH= .00525 total litres of solution= .05 + .035= .085 L [HCl]= .005 mol/.085 L = .0588 M [NaOH]= .00525 mol/ .085 L = .0618 M Ka of HCl= 1.3*10^6 pKa= -log(1.3*10^6) = -6.114 ...
March 22, 2010 by Vanessa

Chemistry
Which of the following result in buffered solutions when equal volumes of the two solutions are mixed? a.) .1 M HCl and .1 M NH4Cl b) .1 M HCl and .1 M NH3 c.) .2 HCl and .1 M NH3 d.) .1 M HCl and .2 M NH3 By def. I know that a buffed solution is made from a weak base and it's...
April 9, 2013 by Marcus

Chemistry
Using Volumetric Glassware to Measure, Dilute,and Titrate Acid Solution 1)For each of the following procedural errors, indicate whether the calculated molarity of the HCl solution would be higher or lower than the actual molarity. Briefly explain. a)The NaOH titrant is ...
April 1, 2011 by Anonymous

Chemistry
if you double the concentration of HCL acid, will that double rate of reaction? i have to explain in terms of the theory of collision. Wont doubling the concentration double the rate as well?
September 25, 2012 by Shreya

Chemistry
Use activity coefficients to find the concentration of hydrogen ions in a solution of 75.0 mM butanoic acid and 0.01 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm. What is the concentration of H+? What is the pH of...
October 11, 2013 by martini

AP Chemistry
50.0 mL of an HCl solution with a pH of 3.5 neutralizes 200.0 mL of a Ca(OH)2 solution. What is the molarity of the Ca(OH)2 solution?
January 30, 2014 by Gabriella

chemistry
A 1M solution (200ml) of NH3 (Kb of ammonia=1.8*10-5) is added to 200ml of 0.5M HCl. Calculate: a) the resulting pH? b) The delta ph due to addition of 15ml of 1M HNO3 to solution obtained in part a c) I am stuck on this: The delta ph due to addition of 15ml of 1M NaOH to the ...
February 13, 2014 by anonymous

Chemistry
Determine the concentration of each type of ion in O.100M solutions of each of the following compounds. a. KBr b. Rb2S c. CuCl2 d. Mg(NO3)2 If someone could just even explain what they are asking for and how to do the problem, I would greatly appreciate it. The idea here is ...
March 25, 2007 by Anonymous

chemistry
a portion (10.0 ml)of a solution containing the chloride anion was treated with silver nitrate to yield a precipitate (0.1713 g) of the silver chloride. calculate the molar concentration of the chloride anion in the solution. first write the equation.
October 18, 2011 by TROUBLED

chemistry
You have 20.00 mL of a 0.1M aqueous solution of the weak base (CH3)3N (Kb = 7.4x10^-5). This solution will be titrated with 0.100 M HCl. How do you find the pH of this solution before any acid has been added.
February 9, 2012 by laura

chemistry
A solution is prepared by mixing 4.62 grams of potassium hydroxide in 1.00 L of water. After that, 250.0 mL of a 0.100 M solution of HCl is added to the solution. What is the resulting pH of the final mixture?
October 9, 2014 by Acrinogy

Chemistry
The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. Please help it only shows a graph with ...
May 13, 2013 by shannon

chemistry
how many mL of 1M HCL is used to make: 100mL of 0.1M hcl 250Ml OF 0.5M hcl 10Ml OF 0.01m hcl
March 29, 2014 by Tammy

Chemistry
The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration 34.67 mL of the ...
October 7, 2014 by melbell

CHEMISTRY (WEBWORK)
What is the pH of the solution created by combining 1.20 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH w/ HCl pH w/ HC2H3O2 1.20 ? ? Complete the table below: What are the pH values if you take into account ...
July 12, 2010 by Anonymous

Chemistry
0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 * 10^-4 M. What is the equilibrium constant, Ka, for this acid? a. 5.0 *10^-2 b. 5.0 * 10^-3 c. 2.5 * 10^-4 d. 2.5 * 10^-5 e. 2.5 * 10^-6 2. (Points: 1) What is the carbonate-ion, CO3^-2, ...
May 13, 2010 by wite2khin

Chemistry
a solution is prepared using .015 L of 1.0 M HCl and .020 L of .50 M HNO3. the final volume of the solution is 1.25 L. Answer th following questions. a)what are the [H3O+] and [OH-] in the final solution? b)What is the pH of the final solution?
May 4, 2010 by Alexa

Chemistry Need Help
How many grams of baking soda, NaHCO3, are needed to react with 125 mL of stomach acid having an HCl concentration of 0.05984 M? The reaction is NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l). Do I need to chenage mL to L first? I'm really stuck with this question. I ...
March 1, 2015 by christine

chemistry
25.0 cm3 of an acidified solution containing Fe2+ ions was titrated against potassium manganate (VII) solution. 20.0cm3 of 0.050M potassium manganate (VII) was needed. Calculate the concentration of Fe2+ ions in the acidified solution.
March 8, 2011 by tam

chemistry
Determine the hydroxide ion concentration in a solution that is 0.0004 M HCl. Answer in units of M. I have no idea how to start, I just need to know what I need to solve for and hoe to set it up, I know the formula pOH^-=-log[OH^-] I just don't know where to plug things in and...
April 16, 2015 by will

College Chemistry (DrBob222)
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?
March 25, 2014 by Anonymous

Chem I
Ok here is another one! Concentrated aqueous HClO4 has a concentration of 14.8 M. Calculate the concentrations of ALL ions present in a solution prepared by pipetting 5.00mL of concentrated HClO4 into a 1000.0-mL volumetric flask and filling to the mark. Also calculate the pH ...
November 15, 2010 by Natalea

chemistry
A student performs a back-titration to determine the cost -effectiveness of an antacid. A tablet with a retail cost of $0.053 is dissolved in 25.00 ml of 1.000 M HCl, then back-titrated with 1.000 M NaOH. Exactly 14.82 ml of NaOH solution is required to reach the endpoint. ...
April 19, 2010 by Lisa

Honors Chemistry
1. What is the pH of a solution whose [H3O+] is 1 X 10^ -5 M? 2. What is the [H3O+] concentration of a solution with a pH of 9? 3. What is the pH of a solution whose [H3O+] concentration is 3 X 10^-3 M? 4. What is the pH of a solution with a [H3O+] concentration of 1 X 10^ -12...
April 6, 2012 by Chris

Honors Chemistry
1. What is the pH of a solution whose [H3O+] is 1 X 10^ -5 M? 2. What is the [H3O+] concentration of a solution with a pH of 9? 3. What is the pH of a solution whose [H3O+] concentration is 3 X 10^-3 M? 4. What is the pH of a solution with a [H3O+] concentration of 1 X 10^ -12...
April 19, 2012 by Kelly

chemistry
Calculate the concentration of all the ions and species in a solution (there are 6) made by dissolving 1.49 g of sodium resorcinate (Na2 C6H4O2) in 100.0 ml of distilled water.
June 29, 2011 by RRG

chemistry
Calculate the concentration in parts per million (ppm) of the solute in each of the following aqueous solutions (a) 0.00500 g of sodium chloride in 850 mL of solution
April 26, 2012 by katiy

physical science chemistry
calculate the mass of sodium nitrate needed to make 550 ml of solution of concentration 0;2 mol.dmc to the power of minus 3
April 8, 2013 by Thuba

science
calculate the concentration for the reaction of 0.25mole 0f sodium hydroxide NaOH and water H20 solution of 250cm^3. Provide the answer in cubuc decimeter
September 16, 2013 by clay

Chemistry
A solution of magnesium chloride, MgCl2, is prepared by dissolving 19.0g of MgCl2 in 250 mL OF water. a.) Calculate the weight percent of magnesium chloride in solution. b.)The denstiy of the above solution is 1.05 g/mL. Calculate the molarity of the magnesium chloride ...
October 24, 2012 by Josh

chem
2 HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l) H = -118 kJ Calculate the heat when 112.4 mL of 0.500 M HCl is mixed with 300.0 mL of 0.515 M Ba(OH)2. Assuming that the temperature of both solutions was initially 25.0°C and that the final mixture has a mass of 412.4 g and a ...
December 1, 2007 by mel

chemistry
530 mL solution 10% HCl has been spilt onto the bench. It cannot be diluted or washed away. How much of the granular NaOH from the container seen in a must be used to neutralise the acid? [Using NaOH: MM = 40 g/mol] 1. I have NaOH + HCl --> NaCl + H2O. 10% HCI in a 530ml ...
October 2, 2014 by Anonymous

chemistry
What must be the minimum concentration of dichloroacetic acid in 1.00L buffer solution of a pH 0.91 dichloroacetic acid/sodium dichloroacetate buffer if the pH changes by 0.2 units when 0.057 moles HCl are added? Dichloroacetic Cl2CHCOOH ka= 5.50E-02 pka= 1.26
February 5, 2015 by Antonette

AP Chemistry
A 1.2M NaOCl solution is prepared by dissolving solid NaOCL in distilled water at 298K. The hydrolysis reaction OCl-(aq) + H2O(l) --> HOCl(aq) + OH-(aq) occurs. a. Calculate the value of the equilibrium constant at 298K for the hydrolysis reaction. b. Calculate the value of...
February 17, 2010 by Anonymous

Chemistry
Ca(IO3)2(s) ⇌ Ca^(2+)(aq) + 2IO3^(-)(aq) First, you poured 30 mL of 0.100 M Ca^(2+) solution over a 2.000 g sample of solid Ca(IO3)2 and allowed the mixture to sit for 30 minutes. Some of the solid dissolved, causing the calcium ion concentration to increase by a certain...
February 6, 2010 by John

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