# Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21. What is the percentage protonation of the solute?

46,915 questions, page 98
1. ## To DrBob222

This is regarding the Biochemistry question postef by Grace.. I'm wasn't able to mention this in the subject section due to the large no.of characters! I apologize for any inconveniences made! In this case,to calculate pH of the solution, we should find

asked by Shenaya on July 23, 2017
2. ## chemistry desperately

i am completely lost, i confused myself. i need to find the concentration of HC2H3O2 HC2H3O2 + NaOH ==> NaC2H3O2 + HOH NaOH C= 0.3 M v= 0.25 L n= 0.075 moles M= 40.00g/mol m= 3.00 g NaC2H3O2 n= 0.075 moles m= 0.4973 g(ammount of acetic acid in solution)

asked by diana on December 16, 2008
3. ## Inorganic Chemistry

I messed up on my titration: filled part of the burette with a supersaturated solution of KHTar(2.073g...MM=188.18amu) dissolved in 150mL diH2O, instead of the 0.051M NaOH solution. I know it wasn't more than a few mL, but I noticed a huge difference in

asked by Christina (PLZ HELP!!) on July 14, 2011
4. ## Statistics

The data below represents six years of the harvest of oranges in millions of boxes and the price per 75 pound box. (a) Plot the data and calculate the regression line. Plot that line. (b)Calculate the coefficient of determination (c)What percent of the

asked by Maria Elizabeth on December 9, 2012
5. ## chemistry

8.58g of coastic soada was dissolved to produce a solution of 500cm3 .to neutralize 50cm3 of this solution 15cm3 of 0.4M HCl was consumed .(coastic soada = Na2CO3.XH2O ) find the value of X?

asked by fathima on December 18, 2012
6. ## ap chem

A certain volume of a .50 M solution contains 4.5g of a certain salt. What mass of the salt is present in the same volume of a 2.5 M solution? Indicate the concentration of each ion/molecule: A mixture of 50.0 mL of .2M KClO3 and 25.0 mL of a .20M Na2SO4.

asked by lily on September 13, 2007
7. ## CHEMISTRY

If a solution is made by dissolving 15g of each solid in the same 100g of water at 70 degrees and the solution is cooled to 20 degrees, crystals are observed.. Which solid crystallises and explain in reference to both solids

asked by Gabrielle M on September 15, 2015
8. ## Chemistry

When ammonium chloride is dissolved in water, the solution becomes colder. What can you say about the relative magnitudes of the lattice energy of ammonium chloride and its heat of hydration? Why does the solution form? What drives the process?

asked by Samantha on September 20, 2010
9. ## Chemistry

A solution is 0.10M Pb(NO3)2 and 0.10M AgNO3. If solid NaCl is added to the solution what is [Ag+] when PbCl2 begins to precipitate? (Ksp PbCl2 = 1.7 x 10^-5; AgCl = 1.8 x 10^-10) The answers is 1.4 x 10^-8 How do I find the answer

asked by Fred on October 14, 2012
10. ## Biochemistry

HELP!! Describe how to prepare 800 ml of a 0.100 M potassium acetate buffer, pH = 4.46 (n.b. pKacetic acid = 4.76). You have glacial acetic acid (17.6 M), a 1.000 M solution of KOH and a 1.000 M solution of HCl.

asked by Jerrica on December 18, 2011
11. ## science

I have used dilute-IT to make a o.1N solution of HCl in .6 N NaCl after bringing the solution to the exact mark on the volumetric flask it lost volume do to off gassing, do I bring it back up to the exact volume?.

asked by Michelle on September 2, 2011
12. ## Chemistry

Suppose you are going to add 450 mL of a 0.10 mol/L hydrochloric acid solution to 250 mL of a 0.2 mol/L sodium hydroxide solution. a)Which one is the limiting reactant? b)What is the theoretical yield of sodium chloride?

asked by Maame on December 10, 2011
13. ## Chemistry

I have water pH 7.0 insulation with various other things that do not affect pH, I am trying to add X amount of HCL to lower the solution to a pH of 1.5 I know pH=-log[HCl] but I'm not sure how to approach this problem, after this I am then trying to add

asked by Margaret on April 24, 2015
14. ## Chemistry

Suppose we are dealing with calcium chloride as opposed to the chemical in the video. If a solution contains 70 g of calcium chloride per 100 g of water at 25 degrees Celsius, is the solution unsaturated, saturated, or supersaturated?

asked by Steptim on July 8, 2013
15. ## Calculus

Show that u(x, t) = f(x−ct)+g(x+ct), where c is a constant and f and g have continuous second derivatives, is a solution of the wave equation in one dimension, ie (∂t)^2 u = c^2 ∂x^2 u. Note that this solution to the wave equation consists of two

asked by Margo on September 30, 2015
16. ## calculus

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) sin θ cos θ − 2 sin θ = 0

asked by stellar on October 21, 2011
17. ## MEC

When 25.0 mL of 1.00 M HCl (0.025 mol)is mixed with exactly 25.0 mL of NaOH (0.025 mol) in a calorimeter, the temperature of the solution increased from 25.00 °C to 27.30 °C. (a) Is the reaction exothermic or endothermic? (b) If the specific heat of the

asked by Jessica jean on December 9, 2015
18. ## Chemistry

What is the volume of a solution of 0.5 M NaOH that must be added to adjust the pH from 4 to 9 in 20 mL of a 100 mM solution of phosphoric acid? Its been about 4 years since I've done this stuff. All I know is the pKa of phosphoric acid is 2.15 and I'm

asked by Waleed on September 23, 2010
19. ## Chemistry

What is the volume of a solution of 0.5 M NaOH that must be added to adjust the pH from 4 to 9 in 20 mL of a 100 mM solution of phosphoric acid? Its been about 4 years since I've done this stuff. All I know is the pKa of phosphoric acid is 2.15 and I'm

asked by Waleed on September 23, 2010
20. ## Chemistry

A solution is prepared that has [NH3]=1.00M and [Cl-]=0.100M. How many grams of AgNO3 can be dissolved in 1.00L of this solution without a precipitate of AgCl(s) forming? Ksp of AgCl = 1.8x10^-10 Kf of [(Ag(NH3)2)+] = 1.6x10^-7

asked by Jeannie on April 14, 2010
21. ## Shawn

How many milliliters of 0.355 M NaF solution are needed to react completely with 24.6 mL of 0.216 M CaCl2 solution? How many grams of CaF2 will be formed? The reaction is CaCl2(aq) + 2NaF(aq) → CaF2(s) + 2NaCl(aq)

asked by Chemistry on July 8, 2011
22. ## chemistry

what is the molality of a 0.068M solution of ethyl alcohol in water at 25 degrees celsius. (assume the density of the solution at such a low concentration is equal to that of water at 25degrees celsius, 0.997g/ml)

asked by belinda on February 2, 2011
23. ## chemistry

what is the molality of a 0.068M solution of ethyl alcohol in water at 25 degrees celsius. (assume the density of the solution at such a low concentration is equal to that of water at 25degrees celsius, 0.997g/ml)

asked by belinda on February 2, 2011
24. ## Math

You have a piece of lumber that is 4 yards long. You want to cut lengths 2/3 yard long to use in a shelf you are building. How many shelves can you cut? Draw a picture of your solution. Explain your solution in words.

asked by Reyna Aureolus on December 3, 2018
25. ## chemistry

A student wishes to prepare 1.000 g of silver chromate. How many mL of .05000M silver nitrate solution should be added to 50.00 mL of .0700M potassium chromate solution assuming 100% yield

asked by mom on September 25, 2012
26. ## Chemistry

if antiseptic hydrogen peroxide is 3% H2O2 by mass, approximately how many moles of H2O2 are present in each gram of antiseptic solution? you can assume the solution has the same density as water. show your calculations.

asked by Ivy on December 2, 2011
27. ## pre-calculus

solve the equation 1. In x + In (x+12) =2 x= ? or either there is no solution 2. solve the exponential equation 9^x=6 What is the exact answer? 3. Use transformations to indentify the graph of the function. Then determine its domain, range, and horizontal

28. ## Chemistry

Suppose we are dealing with calcium chloride as opposed to the chemical in the video. If a solution contains 70 g of calcium chloride per 100 g of water at 25 degrees Celsius, is the solution unsaturated, saturated, or supersaturated?

asked by Moise on May 19, 2013
29. ## chemistry

what volume (in L) of 0.150 M KCl solution is required to completely react with 0.150 L of a 0.175 M Pb(NO3)2 solution according to the following balanced chemical equation? 2KCl (aq) + Pb(NO3)2 (aq) --> PbCl2 (s) + 2 KNO3 (aq)

asked by samantha on June 21, 2010
30. ## Chemistry

a solution of arsenic oxide containing 0.24g required 50cm^3 of acidified potassium manganate of solution of concentration 0.02M for complete oxidation. What is the oxidation state of arsenic in the product?

asked by Bela on October 22, 2014
31. ## Chemistry

2MnO4-(aq) +5 H2O2 (aq) + 6H+(aq) -> 5 O2(g) + 2 (Mn2+(aq) = 8H2O (l) If a 25.00 ml sample of hydro peroxide required 25.25 ml of .353 M KMNo4 solution to react with all the hydrogen perozide what was the molarity of the hydrogen peroxide solution?

asked by Vinny on June 7, 2011
32. ## Chemistry ,Reactions at Electrodes during Electrol

Reactions at Electrodes during Electrolysis Which half-reaction will take place at the cathode during the electrolysis of molten MgCl2? 2Cl- > Cl2 + 2e- Cl2 + 2e- > 2Cl- Mg2+ + 2e- > Mg Mg > Mg2+ + 2e- Which half-reaction will take place at the cathode

asked by Mahtab on April 8, 2012
33. ## Chemistry

Ammonia, NH3 is freely soluble in water, and has the value Kb=1.8x10^-5. If the pH of an ammonia solution is 11.4272, then what original concentration of NH3 (molarity) was used to make up the solution?

asked by Sam on July 27, 2010
34. ## math

Explain, in complete sentences, how you would use the graphing method to solve the following system of equations. Provide the solution to the system and explain what the solution represents on the graph. x + 4y = –16 3x + 2y = 12

asked by ashley on November 5, 2010
35. ## Chemistry

1.)Find the PH of a solution with 0.20M NH3 with 0.15M of NH4Cl. 2.)Find PH of a solution with a mixture of 200mL of 0.50M HCHO2 and of 100mL of .50M NaCHO2.

asked by Chem help me! on May 1, 2012
36. ## CHM 152

An automobile antifreeze contains equal volumes of ethylene glycol (d=1.114 g/mL and FW = 62.07) and water (d=1.00 g/mL) at 25oC. The solution has a density of 1.06 g/mL. What is the molarity of ethylene glycol in the solution?

asked by Car on June 8, 2010
37. ## chemistry

A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 720 mL of solution. What is the pH of this buffer? Ka = 6.2 × 10−6 for HA. Answer in units of pH. please i need the answerf

asked by Anonymous on January 31, 2015
38. ## chemistry

What volume of 9.54M sodium chloride solution must be added to the correct amount of water to produce 750. mL of a .327 M sodium chloride solution?

asked by Dee on November 17, 2010
39. ## CHEMISTRY

You have 875 mL of an 0.53 M acetic acid solution. What volume (V) of 1.30 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.94? (The pKa of acetic acid is 4.76.)

asked by Owen on September 27, 2015
40. ## chemistry(rusting)

i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right?

asked by Kong on November 8, 2011
41. ## Speech

After analyzing a problem, what is the next step in the problem-solving process? a. Develop creative solutions. b. Identify possible solutions. c. Select a solution. d. Implement a solution. I think it might be B

asked by Courtney on April 26, 2011
42. ## Chemistry

You dissolve 1.05 grams of an unknown diprotic acid in 200.0 mL of H2O. This solution is just neutralized by 5.00 mL of a 1.00 M NaOH solution. What is the molar mass of the unknown acid?

asked by Tayla on July 19, 2013
43. ## Chemistry II

A total of 30.6 g of potassium hydrogen phthalate is needed to completely neutralize a 500.0 mL solution of sodium hydroxide. What is the molarity of the sodium hydroxide solution?

asked by Mandy on October 21, 2009
44. ## CHEMISTRY !!! HELP !

You have 875 mL of an 0.53 M acetic acid solution. What volume (V) of 1.30 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.94? (The pKa of acetic acid is 4.76.)

asked by Owen on September 26, 2015
45. ## kv

A reference solution is to be prepared with 5 PPM parabenzopyrene (molecular weight = 252). The quantity of parabenzopyrene required for preparing one litre 5 PPM solution is

asked by poonam on March 5, 2013
46. ## Chemistry

Frances wanted to prepare a 0.0285M standard solution of LiCl. She weighed out 27.5g of solid LiCl. She had plenty of water available. What volume of the solution was she able to prepare?

47. ## algebra 2

1. Find the exact solutions of x^2 - (y-12)^2 = 144 and y = -x^2 Is the answer no solution? 2. Solve the system: y^2 - 4x^2 = 4 and y = 2x Solving this myself I got no solution, but someone who helped me with this question got the answer x= + i sqrt 2, -i

asked by huncho jack on May 3, 2018
48. ## science

you need to make a 3.5 Molar solution of Ca(OH)2, however, you only want to make 50ml of this Ca(OH)2 solution. How many grams of Ca(OH)2 will you need to weigh out and add to 50ml of water? Mass=VolumeinLiters*Molarity*Molmass

asked by brittany on December 12, 2006
49. ## algebra

solve by the elimination method 3r - 7s =-29 7r + 3s = 29 What is the solution of the system? Type an ordered pair. Type an interger or a fraction or type N if there is no solution or type 1 if there are infinitely many solutions.

asked by Cassie on September 8, 2009
50. ## Chemistry

How many milliliters of a 3.85 M solution of Fe2+ are needed to titrate 250.0 mL of a 0.125 M Cro4 2- solution? H + CrO4 2- + Fe2+ yields to Fe3+ + Cr2O3 + H2) (not balanced)

asked by Jane on November 23, 2011
51. ## CHEMISTRY

A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound?

asked by NEHE on October 11, 2013
52. ## Integrated Science

Equal quantities of a strong acid and a strong base are mixed together, forming a solution. What is the pH of the solution? A).close to 7 B).less than 7 C).greater than 7 D).close to 0 I believe the answer is C). Is this correct?

asked by Kiley on December 15, 2018
53. ## Chemistry

Find the pH of a solution prepared by taking a 50.0 mL aliquot of a solution prepared by dissolving 12.25g of NaOH and 250.0 mL of water and diluting that aliquot to 1.00L?

asked by Audrey on January 20, 2011
54. ## maths

Hi Please can you help Find the particular solution of the differential equation from f(x)=(x^2-6x+23)^(3/2)for which y=2 when x = 1, and then give this particular solution in explicit form? Am I correct that the following is the explicit form (not

asked by Claire on March 30, 2011
55. ## biochemistry

You have 325 mL of an 0.11 M acetic acid solution. What volume (V) of 2.00 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.07? (The pKa of acetic acid is 4.76.)

asked by joy on August 31, 2015
56. ## Differential Equations

we are to find the power series solution for y'=xy. I have calculated to the point that I believe the answer is c_0/2^n*n! First of all is this correct and secondly, how do I write the solution in terms of c_0 * summation of something in terms of x^n?

asked by Anonymous on April 22, 2018
57. ## Chemistry

Urea (NH2)2CO is dissolved in 100.0 g of water. The solution freezes at -0.085 degrees C. how many grams of urea were dissolved to make this solution.

asked by Lauren on February 7, 2008
58. ## Chemistry

Write an equation to represent the oxidation of I- to I2 in acidic solution, with ozone as the oxidizing agent. I know ozone will be reduced to H2O, but I am not sure how to figure out the acidic solution. Thank you!

asked by Anonymous on March 17, 2015
59. ## Chemistry

Help! I have to get this done tonight and I cannot get this answer right. A solution of water (Kf=1.86 ∘C/m) and glucose freezes at − 3.55 ∘C. What is the molal concentration of glucose in this solution? Assume that the freezing point of pure water

asked by Emmalee on February 28, 2016
60. ## matrices

Let A be a 5 by 4 matris and suppose that the system Ax=b has a solution. Explain why the solution is unique if and only if the rank of A is 4. I said that it is unique becaue the rank is equal to the number of columns. Do you have a better explaination.

asked by jen on August 4, 2008
61. ## Chemistry

If you try to carry out a double displacement reaction by mixing together equal volumes of a solution that contains dissolved NaF and a solution that contains dissolved NaCl. Would you expect a reaction? Why or why not?

asked by Rebecca on November 28, 2016
62. ## CHEMISTRY

If 33.7 ml of 0.210 M KOH is required to completely neutralize 27.0 ml of a HC2H3O2 solution, what is the molarity of the acetic acid solution? HC2H3O2(aq)+ KOH(aq)-->KC2H3O2(aq)+H2O(l)

asked by Michael on May 12, 2012
63. ## (expi)^i

can someone tell me how can we calculate (expi)^i. there is one thought to say that it is equal to exp(-1) but this is not true. i think that one has to use the euler's equation : exp(ix)=cosx+isinx. but in this case, x=1? and how can we calculate after

asked by natassa on March 3, 2007
64. ## chemistry

Rubidium crystalizes in the body centred cubic structure with an edge length of 560.5 pm.. a. calculate the radius (in pm) to 4 sig figures. b. calculate the density to 4 sig.fgures. thnks guys..

asked by amanda on December 4, 2011
65. ## chemistry

Calculate the concentrations of all species in a 1.67 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. I know how to find the Na^+ and SO3^-2 but I don't know how to find

asked by Johnny on June 17, 2012
66. ## chemistry

he Fe(ox)33– complex ion creates an emerald green solution when dissolved. The observed solution color of the complex indicates the size of o is: A. large. B. small. C. in between. D. inconclusive, more information is needed. The observed solution color

asked by .... on June 30, 2010
67. ## Algebra 2

How much pure acid must be added to 6 milliliters of a 5% acid solution to produce a 40% acid solution? Please Show All Work!

asked by Trisan on October 18, 2009
68. ## algebra

A radiator contains 6 liters of a 25% antifreeze solution. How much should be drained and replaced with pure antifreeze to produce a 33% antifreeze solution?

asked by tor on September 15, 2014
69. ## Algebra 1

Bunson Burner has 3 liters of a 10% acid solution. How much of pure acid must be added to produce a 50% acid solution?

asked by Cassidy on March 28, 2011
70. ## chemistry

Hello, Please help me with this question! Which dilution would turn 10% (by mass) HCl solution into 0.100 M HCl solution? Density of 10% HCL = 1.08 g ml^-1

asked by Ann on July 23, 2014
71. ## Chem molarity

A beaker contains 100 grams of 1.20 M NaCl. If you transfer 50% of the solution to another beaker, what is the molarity of the solution remaining in the first beaker?

asked by Toni Jones on March 1, 2011
72. ## Chemistry

A saline solution with a mass of 400 g has 30 g of NaCl dissolved in it. What is the mass/mass percent concentration of the solution?

asked by Sabrina on April 7, 2016
73. ## Chem

We want to make 40. mL of 0.50 M HCl by diluting the stock 2.0 M HCl solution with water. What volume of 2.0 M HCl solution is needed?

asked by rahim on April 12, 2010
74. ## chemistry

What volume of a concentrated HCl solution, which is 36.0% HCl by mass and has a density of 1.179 g/mL, should be used to make 4.60 L of an HCl solution with a of 1.9? HELP!!!

asked by Stacy on December 6, 2010
75. ## chemistry

What would be the final concentration of [K+] if we mix 0.234 L of a solution with a concentration of 1.2M K2CO3 with 312.5 mL of a solution with a concentration of 0.32 M K3PO4

asked by John on April 10, 2014
76. ## Physics

A 50kg by runs up the steps to the third floor of height 10.5m in 45s.While at the third floor,the boy drops a 0.25kg ball and strike the ground 1)Calculate the rate of work done. 2)By using work-energy theorem,calculate the speed of the ball just before

asked by Anonymous on October 3, 2017
77. ## statistics

In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: Fifteen (15) lung cancer deaths occurred among

asked by DANIELLE on April 10, 2008
78. ## statistics

In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: • Fifteen (15) lung cancer deaths occurred

asked by DANIELLE on April 10, 2008
79. ## Math - Probability Statistics

P(E)=.4, P(F)=.5 and P(E[intersect]F)=.1 , Calculate P(F|E)=? Using conditional probability, I got .2 as the answer, using: P(E[interstect F)/P(F) = .1/.5 = .2 Calculate P(E|F) is .25 using: P(E[intersect F)/P(E) = .1/.4 =.25 Is this now correct?

asked by Dee on August 31, 2009
80. ## Physical Science

How do you calculate the mass and volume of an irregular solid object and calculate the density of that object?

asked by Alex on January 25, 2009
81. ## geometry

In the following figure given a circle C(o,3) Bp=AB and BA^N = 30 a) Calculate AP,BN and AN b)Calculate AQ and BQ c) Show That M is the mid point of (AP) d)Show that (OM)is perpendicular to (A)

asked by Nour on April 16, 2010
82. ## geometry.

use midpoint formula to calculate the midpoint of AB. Name it point M and plot it in the graph. Calculate lengths AB, AM, MB. thanks for help.

asked by robin on April 6, 2015
83. ## chemistry

% recovery: how do i calculate it? we're doing a recrystallization in chem class we used 0.1 g and we recovered 0.3 g how do i calculate the percent recovery?

asked by jessie on February 9, 2011
84. ## chemistry

The Fe(ox)33– complex ion creates an emerald green solution when dissolved. The observed solution color of the complex indicates the size of o is: A. large. B. small. C. in between. D. inconclusive, more information is needed. The observed solution color

asked by Jin on June 30, 2010
85. ## Chemistry

At 298 K, deltaGo = - 6.36 kJ for the reaction: 2N2O(g) + 3O2(g) ↔ 2N2O4(g) Calculate deltaG (in kJ) at 298 K when PN2O = 3.12 atm, PO2 = 0.0081 atm, and PN2O4= 0.515 Calculate deltaG (in kJ) at 298 K for some solid ZnF2, 0.025 M Zn2+ and 0.038 M F-(aq).

asked by Anonymous on April 3, 2013
86. ## Chemistry

The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium

asked by Aaron on September 19, 2014
87. ## Chemistry

The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium

asked by Aaron on September 19, 2014
88. ## Chemistry

When treating a patients physicians use an isotonic means that this solution will have the same osmotic pressure as the body fluid such as blood. how many grams of glucose (C6H12O6) is in 100.0 g of H2O in the isotonic glucose solution (5.00% m/m)?

asked by Tina on December 10, 2014
89. ## chemistry

A solution is made by mixing 35.0 mL of toluene C6H5CH3d=0867gmL with 125.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are how do you find the L of SOLUTION

asked by J on June 24, 2010
90. ## chem

The solution of known concentration to use to evaluate Z was prepared as follows: 2.00mL of 0.00201 M KSCN and 18.0 ml 0.200 M Fe (NO3)3. Assume that all of the SCN- has been converted to Fe(SCN)2t in this solution. Fe3+ SCN- ==== Fe Fe(SCN)2+ I don't

asked by Steph on March 1, 2015
91. ## Chemistry

A precipitation reaction takes place when a water solution of potassium phosphate, K3PO4, is added to a water solution of cobalt (II) chloride, CoCl2 Write a balanced equation for this reaction

asked by Marissa on November 15, 2016
92. ## math-matrix equations

I have a problem with the following homework question: Which product represents the solution to the system: -y + 7x=14 -x + 4y=1 a. | (1/27) (4/27)| | (7/27) (1/27)| b. | (-7/3) (4/3) | | (-1/3) (1/3) | c. | (7/3) (-4/3) | | (1/3) (-1/3) | d. | (-1/27)

asked by Jennifer on May 2, 2008
93. ## CHM 300

Experiment: Redox titration;determination of ascorbic acid by an iodometric back-titration Why is sodium carbonate added to the thiosulfate solution ? why is the water used for preparing the thiosulfate solution boiled ?

asked by Jennifer on September 26, 2014
94. ## college algebra

write the expression as a single logarithm 1. In(x/x*2)+In(x+2/x)-In(x^2-4) solve the following logarithmic equation. 2. log_9(x-2)+log_9(x+1)=2 what is the exact solution? What is the decimal approximation for the solution when rounded three decimal

95. ## math

Describe two ways to determine whether or not a given point is a solution of a line. Which way is more accurate? Why? The only practical and fast way is to substitute the coordinates of the point into the equation. If the equation is "true", then it is a

asked by heather on July 30, 2007
96. ## Chemistry

The solubility of lead (II) chloride in water is 4.50 g/L at 25 degrees C a. What is the molarity of Pb2+ in a saturated solution b. What is the molarity of Cl- in the solution in the previous problem c. What is the equilibrium constant for the reaction:

asked by sea lively on August 13, 2018
97. ## Science (Chemistry)

A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached

asked by Anon on February 2, 2014
98. ## Chemistry

8 g of sulphur is burnt to form SO2 which is oxidized by Cl2 water The solution is treated with BaCl2 solution The amount of BaSO4 precipitated is A/ I mole B/ 0.5 mole C/ 0.24 mole D/. 0.25 mole Which option is correct??

asked by Viraj on June 24, 2014
99. ## Science (Chemistry)

A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached

asked by Anon on February 2, 2014
100. ## Chemistry

Complete and balance these half-equations. Express as net ionic eqn. 1.) Cr2O7(2−) → Cr(3+) (acidic solution) So far, I have: Cr2O7(2−) + 14H + 6e(-) →2Cr(3+) + 7H20 2.) C2O4(2−) → CO2 (acidic solution) Not sure how to do this one. Thank you.

asked by Daniel on April 14, 2016