# 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 104-
## chemistry

You are given a 500 mL stock solution of 10%CaCl2 and are askes to prepare a 50 mL solution of .5% CaCl2. How would you prepare it? Please show work

*asked by morgan on February 6, 2017* -
## chemistry

starting with a 30% (W/W) SOLUTION OF HYDROGEN PEROXIDE, how many mL would you need to dilute on order to end up with 25.00ml of a 3.6M hydrogen peroxide solution?

*asked by sue on November 5, 2012* -
## AP Bio (but its a question about chemistry)

no idea how to do this... describe how you would prepare from the specified stock solution: 400 mL of 0.45 M urea starting with a 6 M urea stock solution

*asked by katie on July 24, 2011* -
## Algebra 2

How many liters of water must be added to 8 liters of a 40% acid solution to obtain a 10% acid solution? Please Show All Work!

*asked by Trisan on October 18, 2009* -
## chemistry

Find the volume of a 2.5 M solution of sulfuric acid required to prepare 300.0 mL of 0.1 N solution of sulfuric acid

*asked by Cole on October 7, 2015* -
## Chemistry

Describe, in detail, how to make 5.5 liters of a 2.5 molar HCl solution from a 10.5 molar HCl stock solution.

*asked by Kristen on February 22, 2011* -
## Chemistry

A solution of 0.2M nitric acid is to be prepared from a 4.5M solution. How much nitric acid needs to be diluted in a50ml volumetric flask?

*asked by Gunnary on May 12, 2019* -
## algebra

Use the discriminant to determine the following equations have that are two different rational solutions:two different irrational solutions or exactly one rational solution or two different imaginary solution. x^2=5x+6

*asked by mema on June 9, 2011* -
## Algebra Quadratic Equations

When a quadratic equation has one solution, there will be one x-intercept; when there are two solutions, there will be two x-intercepts and when the equation has no solution, the graph will have no x-intercepts",is there another way of determining this?

*asked by Marysvoice on February 13, 2008* -
## Math

Solve triangle ABC if b = 10, c = 9.1, and C = 53.6 degrees. How many solutions are there? First Solution:What are angle A and B and Side a. Second Solution: What are angle A and B and Side a. Thanks!

*asked by Rosetano on February 24, 2012* -
## Chemistry

I am translating the sentence "HF can be added to calcium carbonate to produce aqueous calcium fluoride carbon dioxide (CO2) and liquid water" into a chemical equation. I'm not sure how you write out Calcium Carbonate symbolically, or how you write clacium

*asked by Gwen on April 2, 2009* -
## CHEM

A concentrated weak acid is best described as which of the following? (a) a solution with a high pH (b) a solution where the concentration of undissociated acid particles is high and relative quantity of hydronium ions is low (c) a solution where the

*asked by Lena on July 24, 2009* -
## chemistry

1 L FLASK CONTAINS NITROGEN ALONG WITH A DROP OR TWO OF WATER AT 40C THE TOTAL PRESSURE BEING 760 TORR .IF ALL THE CONTENTS ARE TRANSFERRED TO ANOTHER FLASK OF 0.5L AT THE SAME TEMPERATURE WHAT WILL BE THE PRESSURE SET UP IN THE SECOND FLASK? (AQUEOUS

*asked by Anonymous on September 30, 2010* -
## chemistry

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water?

*asked by j on October 4, 2010* -
## chemistry

1 L FLASK CONTAINS NITROGEN ALONG WITH A DROP OR TWO OF WATER AT 40C THE TOTAL PRESSURE BEING 760 TORR .IF ALL THE CONTENTS ARE TRANSFERRED TO ANOTHER FLASK OF 0.5L AT THE SAME TEMPERATURE WHAT WILL BE THE PRESSURE SET UP IN THE SECOND FLASK? (AQUEOUS

*asked by Anonymous on September 30, 2010* -
## physics

An object(A) of mass 0.2kg strikes a second object (B) of mass 0.35kg that is initially at rest. Mass A has an initial velocity of +3m/s. A) Assume that the collision is entirely inelastic. calculate the final state for these objects. calculate the total

*asked by issak on July 19, 2011* -
## Chemistry

Balance Eq.: Na2Co3+ CaCl2--> CaCo3+ 2NaCl. (CHALK) Calculate the mass of a dry precipitate. Calculate the mass of moles of the precipitate produced in the reaction.

*asked by Monte; on October 28, 2007* -
## phy

a 25 kg rod has a box hanging from it and is suspended from the ceiling by the string. The entire system isin equilibrium. Calculate the tesnion in the string and calculate the mass of the box

*asked by ami on October 24, 2010* -
## physics

The minute hand of a large clock is 0.50 m long. (A) Calculate its linear speed at its tip in meters per second. (0.000873 m/s) (B) Calculate the centripetal acceleration of the tip of the hand. (1.52 x 10-6 m/s2)

*asked by Steffine on January 7, 2014* -
## Chemistry

Using the bond entalpies ∆H: C---C: 348kJ C=C: 612 kJ C—C (triple bond) : 960 kJ C---H: 412 kJ H---H: 436 kJ Calculate the calculate the value of ∆H of reaction for H2C=CH2(g) + H2(g) → CH3—CH3(g)

*asked by Anonymous on February 17, 2009* -
## calculus

The area enclosed between the x-axis, the curve y=x(2-x) and the ordinates x=1 and x=2 is rotated through 2π radians about x-axis. ( a)Calculate the volume of the solid revolution formed. (b)Calculate the rotating area.

*asked by shah on May 27, 2012* -
## Gr 12 math

I need to calculate the volume of a parallelepiped using the scalar triple product. I can do this if i have vectors. however instead we've been given 8 points which mark the corners. HELPPP this is the question: Calculate the volume of the parallelepiped

*asked by Teniel on September 6, 2008* -
## Physics: Kinematics

A drag racer can travel a displacement of 120m in 5.00s starting from rest. Calculate the acceleration of the drag racer. Can you calculate the final momentum of the car?

*asked by Blnde on October 16, 2018* -
## Business Statistic

X f(x) 0 .25 1 .20 2 .15 3 .30 4 .10 Is it prpbsbility distribution valid? Explain and list the requirement for a valid probability distribution Calculate the expected value x Calulate the variance of x calculate the standard deviation of x

*asked by Laverne on October 16, 2010* -
## Chemistry

Calculate the ratio of the effusion rate of oxygen gas (O2) to that of nitrogen gas (N2). Express your answer in decimal form and calculate your answer to at least four sig figs.

*asked by Mary on September 23, 2010* -
## Chemistry/Normal Distributions/Math

I'm confused on how to calculate the standard deviation for this... The 95% confidence limit for calcium in control sera is reported as 9.2-10.2 mg/dl. Calculate the value for one standard deviation and the coefficient of variation for this data.

*asked by Maranda on January 21, 2013* -
## Physics

A particle moves in three dimensional space as an equation r= (t^2+1.34t)i^+(3.34t-2)j^+(2t^3-4t^2)k^ where is in unit of meter and in second. a.Sketch the path of this particle b.Calculate velocity at c.Calculate acceleration at

*asked by Supansa on February 20, 2016* -
## calculus

The area enclosed between the x-axis, the curve y=x(2-x) and the ordinates x=1 and x=2 is rotated through 2π radians about x-axis. ( a)Calculate the volume of the solid revolution formed. (b)Calculate the rotating area.

*asked by fifi on May 27, 2012* -
## Physics

A particle moves in three dimensional space as an equation r= (t^2+1.34t)i^+(3.34t-2)j^+(2t^3-4t^2)k^ where is in unit of meter and in second. a.Sketch the path of this particle b.Calculate velocity at t=2 s c.Calculate acceleration at t=2 s

*asked by Supansa on February 21, 2016* -
## mechanics

A ball of mass 0.75kg moving horizontally at 5m/s strikes a vertical wall and rebounds with a speed of 2m/s.find (a)what is the impulse received by the ball?(b)calculate the coefficient of restitution(c)calculate the kinetic energy of the ball before and

*asked by Anonymous on April 1, 2017* -
## Physics

1000cm3(cude) of air at 20C and 101.35kpa is heated at constant pressure until its volume doubles. (A) use the ideal gas equation to calculate the final temprature of the gas? (B) calculate the work done by the gas as it expands.

*asked by Anonymous on October 25, 2018* -
## mechanics

A ball of mass 0.75kg moving horizontally at 5m/s strikes a vertical wall and rebounds with a speed of 2m/s.find (a)what is the impulse received by the ball?(b)calculate the coefficient of restitution(c)calculate the kinetic energy of the ball before and

*asked by Anonymous on April 1, 2017* -
## Science(applied physics)

At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.

*asked by Bessy on February 17, 2013* -
## Math.stat help :(

Consider the following hypothesis statement using alpha = .05, and data from two independent samples: Ho: µ1 - µ2 = 0 Ha: µ1 - µ2 not equal to 0 X1 = 237, X2 = 218 ¬1 = 54, ¬2 = 63 n1 = 42, n2 = 35 a) Calculate the appropriate test statistic and

*asked by Williams on November 30, 2013* -
## chemistry

How many moles are in 13grams of C6H6. should this question be broken down into its imperical formula (CH)6 and calculate the number of moles of CH and multiply by 6 or calculate the gram molecular wt of C6H6 and divide it into 13 grams?

*asked by richard on January 23, 2010* -
## Geometry

Assume each side of the hexagon is worth 10 units. Calculate the apothem, using the fact that it is part of a special triangle to get the answer exactly. Then use the exact value of the apothem to calculate the area of the hexagon.

*asked by Brie on January 14, 2013* -
## math

Consider the following hypothesis statement using alpha = .05, and data from two independent samples: Ho: µ1 - µ2 = 0 Ha: µ1 - µ2 not equal to 0 X1 = 237, X2 = 218 ¬1 = 54, ¬2 = 63 n1 = 42, n2 = 35 a) Calculate the appropriate test statistic and

*asked by Lea on November 29, 2013* -
## Chemistry

a)Calculate the lattice constant a in palladium (Pd).express your answer in angstroms. b) Calculate the distance (in angstroms) between adjacent (110) planes in palladium (Pd). Hint: use your work from part (a).

*asked by selly on November 22, 2012* -
## chemistry

Calculate the energy needed to produce 10 moles of Cl2O7 using this balanced equation. 2Cl +70+ 100kCal==2ClO7 please explain steps if I needed to calculate for 7 moles, how would it change?

*asked by lulu on April 16, 2016* -
## Science(applied physics)

At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.

*asked by Bessy on February 17, 2013* -
## CHEMISTRY- answer check

A 0.386g sample of a protein was dissolved in water and made up to a volume of 60mL at 21.0°C. At this temperature the osmotic pressure of this solution was 1.24mmHg. Calculate the molecular mass of the protein 12682 g mol-1 95025 g mol-1 9627613 g mol-1

*asked by lulu on October 9, 2010* -
## Chem Help :(

What is the pH of a solution in which [H3O^+] = 6.8 x 10^-5 M? What is the pH of a solution in which [OH^-] = 2.5 x 10^-9 M?

*asked by Tom on February 17, 2014* -
## Mathematics

Am I right?? |a| -3/4 = -5/8 A) 1/8 or -1/8 B) 7/8 or -7/8 C) 1 3/8 or -1 3/8 D) No Solution** Wouldn't this just come out to to no solution..??

*asked by Logan82 on October 17, 2017* -
## math

x=9 is a solution of the inequality x-3 is less than 7 but x= 10 is not a solution

*asked by Anonymous on December 10, 2009* -
## Math

What are the solution of the system? y=x^2+3x-4 y=3x+2 A (-3,6) and (2,-4) B(-3,-4) and (2,6) C (-3,-4) and (-2,-2) D no solution I think it is D

*asked by Pal on May 22, 2018* -
## 10th grade

scientist needs 5L of 12% solution. She has on 10% and 17% solution. How much of each does

*asked by darren on October 1, 2010* -
## Algebra

What is the solution to 5q=-75? A. q=-25 B. q=-15 C. q=15 D. q=25 what is the solution to r/-3=12? A. r=-36 B. r=-4 C. r=4 D. r=36 Is the answers A and D?

*asked by Darius on September 28, 2016* -
## physics

What is a solution? What are the 2 parts of a solution

*asked by keria on January 20, 2012* -
## Math

3.) What is the solution to -33+m=10? 4.) what is the inverse to 38 5.) What is the solution to y+7=-9

*asked by Caylee on September 21, 2015* -
## intermediate algebra

1.(5,1)is a solution to the equation2x-3y=7.what does this mean? 2.(-3,_)ia solution of =4-3x

*asked by keke on February 20, 2010* -
## algebra

what is the solution for 3x=27-15x and what is the solution for 7(2-m)=3m

*asked by Cristine on September 29, 2009* -
## important math question

the equation x^3 -x-5=0 has one solution for x between -2 and 2. what is the solution? how do I get this

*asked by sara on August 17, 2014* -
## science

How many ml of a 2% solution will 20 ml of a 10% solution make?

*asked by jenny on September 11, 2012* -
## algebra

continued 4c=3d+3 c=d-1 i got (6,7) x=1/2y+3 2x-y=6 i got no solution 8x+2y=13 4x+y=11 i got no solution 2x-y=-4 -3x+y=-9 i got (13,30) 3x-5y=11 x-3y=1 i got (7,2)

*asked by Chris on November 18, 2008* -
## Algebra

Match ABCDE with the solution set below A. {4/3, -4} B. {x|x > 4 or x < -4/5} C. No Solution D. {x| -11 < x < -7} E. All Real Numbers Solution set ABCDE|x + 9| < 2 ABCDE|5x - 8| > 12 ABCDE|3k + 4| = 8 ABCDE|x - 6| = -10 ABCDE|6x + 8| > -4

*asked by Nick K. on June 7, 2009* -
## chemistry

Flask A contains 100 milliliters of a solution with a pH of 5. After you add 100 milliliters of a solution from Flask B, the pH rises to 7. What was the pH of the solution in Flask B?

*asked by Katy on September 5, 2014* -
## AP Chemistry

A sample of potassium nitrate (49g) is dissolved in 101g of water at 100°C, with precautions taken to avoid evaporation of any water. The solution is cooled to 30°C and no precipitate is observed. The solution is ________. A. Hydrated B. Supersaturated

*asked by Anonymous on November 15, 2009* -
## Chemistry

Please help me answer this question; The goal of the recrystallization procedure is to obtain purified material with a maximized recovery. For each of the following, explain why this goal would be adversely affected. a) In the solution step, an

*asked by Judy on February 8, 2010* -
## Veterinary Medicine Math calculations

I was so thankful to see this exact question answered in a different way but I still don't understand how I'm suppose to know how or what to do on the following question. I just seem to always forget something. Fifty milliliters of a solution of 50%

*asked by Selina on February 6, 2017* -
## Physics

8. In an ultracentrifuge a solution is rotated with an angular speed of 3000 rev/sec at a radius of 10 cm. How large is the centripetal acceleration of each particle in the solution? Compare the centripetal force needed to hold a particle of mass 10-5 gm

*asked by Pakilina on November 28, 2011* -
## chemistry

three student chemists measured 50.0 mL of 1.00 M NaOH in separate Styrofoam "coffee cup" calorimeters ( Part B). Brett added 50.0 mL of 1.10 M HCI to his solution of NaOH; Dale added 45.5 mL of 1.10 m HCL 9 eqaul moles) to his NaOH solution. Lyndsay added

*asked by Daniel on January 17, 2011* -
## physics

While sitting on a frozen pond, a 35kg child throws a 0.5kg ball horizontally at a velocity of +6m/s. Calculate the resulting velocity of the child across the ice.Suppose the child throws the ball upward instead, at a 25o angle above horizontal. a)

*asked by taryn on October 2, 2012* -
## Biology

Which solute out of protein, urea, glucose, chloride, ammonia, "substance x" cannot be filtered into the nephron? Why? I know that urea, protein, and chloride ions can be filtered. I don't know about glucose, ammonia or substance x.

*asked by Anonymous on October 14, 2007* -
## Physics

2. A pool has an area A = 50 m2 and depth h = 2.5 m. The pool is filled with water to the maximum height. An electrical pump is used to empty the pool. There are two pipes coming out the pump: one is submerged into water has a radius r1 = 4 cm the other

*asked by Sean on April 13, 2012* -
## Chemistry

Can you check if this is correct please? a) How many moles of sodium hydroxide are there in 19.00 cm3 of 0.100 mol dm3? My answer: 0.0019 mol b) How many moles of hydrochloric acid are, there in 25.00 cm3 of the acid solution? My answer: 0.0019 mol c) How

*asked by Franky on October 16, 2011* -
## chemistry

Problem 3 A publication this year in the journal Yeast (who’d have thought!) by a Scottish group described their development of a spectrometric procedure to monitor the concentration of glucose, ethanol, biomass, and protein content in a vat during the

*asked by asery on May 5, 2016* -
## Maths

Chris wants to put a concrete path and a fence around his rectangular garden. The concrete path will be 1 meter wide and the fence will go around the edge of the path. The garden itself measures 5 meters by 8 meters. A)Calculate the perimeter of the fence.

*asked by Anonymous on February 24, 2011* -
## biology

The micelle and the liposome are two structures formed by phospholipids in an aqueous environment. They are represented here in cross section. The letters A, B, C, and D represent different regions. Four different molecules are shown below. For each,

*asked by selly on March 13, 2013* -
## Physics

A sphere of radius 10 cm is charged to a potential of 500V. Calculate the outward pull per unit area. Ans: 1390 * 10^-8 N/m^2 -------- I'm sure the calc is simple, but how do I calculate "outward pull" from voltage?

*asked by Sean on December 24, 2009* -
## Physics

A) Calculate the kinetic energy of a 5.0g bullet travelling with a velocity of 400^ms-1. B) Calculate the gravitational potential energy relative to the ground when a bird of mass 105g is 400m above the ground.

*asked by Syafiqa on July 17, 2010* -
## Chemistry

(A) calculate the density of NO2 gas at 0.970atm and 35 Celsius. (B) calculate the molar mass of a gas if 2.50g occupies 0.875L at 685torr and 35 Celsius. Answers are 1.77g/L 80.1g/mol

*asked by Kate on January 20, 2018* -
## chemistry

28cm3 of 0.2mol of sodium hydroxide was titrated against 25cm3 of hydrochloric acid using methyl orange as indicator, calculate the concentration in mol/dm3,calculate the concentration in g/dm3

*asked by rukayya on September 19, 2017* -
## math help

Let u = [2,−3, 1] and v = [0, 1, 4]. Calculate the vector u − v. Place u and v tail-totail to form two sides of a triangle. With regard to this triangle, what does u−v represent? Calculate the number u•u and discuss its relevance to the diagram you

*asked by jillian on April 15, 2010* -
## Chemistry

For a chemistry lab, I have to calculate the heat of combustion of paraffin wax. So how would I do that? And for the second part of the lab, I have to calculate the heat of fusion of ice from my data. How would I do that? I'm kind of confused so can I get

*asked by Anonymous on September 9, 2017* -
## chemistry

A titration to standardize a HCl solution was performed by taking 50.0ml hydrochloric acid in a flask with a few drops of phenolphthalein indicator. The burette was filled with 0.15 molar NaOH. The initial reading of the burette was 0.50ml and the final

*asked by martha on March 14, 2017* -
## General Chemistry.

The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.765 and the molar absorptivity coefficient is 86,300 M–1cm–1. The molecular weight for chlorophyll

*asked by Shardae. on November 7, 2012* -
## Chemistry!HELP

32.12mL of 10.0 mol/l potassium chromate solution is reacted with 120.0m of 2.00mol/l lead (II) nitrate solution. The balanced equation is; 2KCrO4(aq)+Pb(NO3)2(aq)==>2KNO3(aq)+Pb(CrO4)2(s) a. Determine the limiting reactant b. What is the maximum mass, in

*asked by Lee L on November 20, 2017* -
## SCIENCE

ALuminum can be determined gravimetricaly by the reaction with solution of 8-hydroxyquinoline (C9H7NO3).The net ionic equation . A mass of 0.1248g of Al(C9H6NO)3 WAS obtained by precipitating all of the the Al3+ from a solution prepared by dissolving

*asked by NELLY on January 15, 2015* -
## Analytic chemistry

A solution of HClO4 was standardized by dissolving 0.3745 g of primary standard grade HgO in a solution of KBr. The liberated OH- required 37.99 mL of the acid to be neutralized. Find the molarity(M) of HClO4. The given balanced chemical equation is: HgO +

*asked by Smile on January 21, 2015* -
## Chemistry

KClO3 decomposes in the presence of MnO2 to form oxygen gas, collected over H2O at 23.0 degrees C and a barometric pressure of 754.2 torr, as described in the experimental description. After the pressure of the oxygen gas is equalized with atmospheric

*asked by Anonymous on July 9, 2008* -
## Physics

calculate the electric potential at a point P, a distance of 1m from either two charges of +10uC and -5uC which are 10cm apart. Calculate also the potential energy of a +2uC charge placed at a point,P

*asked by Evans on September 3, 2018* -
## chemistry

1) a student used 3.50 g of salicylic acid. calculate theoretical yield 2) the actual yield (from experiment) was found to be 1.50 g less than the theoretic yield (mass), calculate the percent yield 3) t

*asked by ama on July 18, 2012* -
## math

Class ring:$89 Group discount:17% Sales tax:5% make sure to calculate the discount price first and then calculate the tax round to the nearest penny

*asked by Taylor on October 17, 2013* -
## College Physics

Calculate the voltage required to accelerate a beam of protons initially at rest if they have a kinetic energy of 2.7 eV. deltaV = V Calculate their speed if they have a kinetic energy of 2.7 eV . v = m/s

*asked by Lanise on January 31, 2010* -
## Chemistry

A solution of 100.00mL of 0.2000mol/L sodium carbonate and 200.00mL of 0.1000mol/L calcium nitrate solutions are mixed together according to the reaction: sodium carbonate + calcium nitrate→ calcium carbonate + sodium nitrate. how would you calculate the

*asked by Walker on August 20, 2012* -
## science

Acetic acid (CH_3COOH) is a weak acid. a) Write the symbolic equation showing the ionisation of acetic acid. b)Given that an acetic acid solution of pH 4.8 has a hydrogen ion concentration of 1.58 * 10^-5 mol L^-1, what is the concentration of the acetate

*asked by anonymous on January 19, 2018* -
## Chemistry

How would you start and finish these questions by a step by step process? Does Amp equal to Joules? 1. How many grams of aluminum can be produced by the electrolysis of aqueous aluminum chloride by a current of 5.00 amps for 5.00 hours? 2. Consider the

*asked by Erika on April 6, 2014* -
## math

You have an aquarium for your new pet, “Shamu” the killer whale, that contains 100,000 pounds of ocean water with a salinity of 30 o/oo. a. Calculate how many pounds of salt are currently in the aquarium. b. You think Shamu may be allergic to salt, so

*asked by amanda on August 21, 2012* -
## College Chemistry 104

Students are attempting to construct a battery in the laboratory that will light up a light bulb. Compare the following lists prepared by students and determine which student will not be able to successfully build a "battery" that will light up the bulb.

*asked by Claire on May 10, 2013* -
## chemistry

the mass number is used to calculate the number of-----------in one atom of an element. in order to calculate the number of neutrons you must subtract the ------from the-----------

*asked by jennifer on October 7, 2008* -
## Chemisty

A 5 μL drop of compound X, a 7 μL drop of compound Y, and a 15 μL of compound Z are placed in a closed container with 5 mL water and 2.5 mL air. The system is equilibrated at 25°C. Determine the fraction of the total X, Y, and Z mass associated with

*asked by Anonymous on September 2, 2014* -
## Chemistry

Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32]

*asked by Alexander on February 19, 2017* -
## Chemistry

Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32]

*asked by Anonymous on February 19, 2017* -
## chem 100

Super confusing question im not sure how to approach a. Determine the concentration of lead ion in solution (the molar solubility) if PbI2(s) is in equilibrium with water. Ksp = 9.8*10-9 b. From part a, it should be clear that if Pb2+(aq) and I-(aq) are

*asked by Mall on May 21, 2015* -
## chemistry

A solution contains an unknown amount of dissolved magnesium. Addition of 5.34×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in the solution.

*asked by bob on September 30, 2014* -
## Chemistry

A solution contains an unknown amount of dissolved magnesium. Addition of 3.38×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in this solution?

*asked by Courtney on October 3, 2013* -
## Pre-algebra

Hi need help answering this question? In your own words, define the term equation and then explain what it means to solve an equation. Give an example of an equation and its solution. Explain why it is the solution.

*asked by clarissa on May 21, 2011* -
## chemistry

you dissolve x in 175g of water to make a saturated solution at 50 degrees celcius. if the solution is cooled to 10 degrees celcius, how many grams of x settle out? (x=15.0 at 50 degrees)

*asked by steve on October 13, 2010* -
## college algebra

Find all real solutions of the equation. (Enter your answers as a comma-separated list. If there is no real solution, enter NO REAL SOLUTION.) x4 + 27x = 0

*asked by tara on September 5, 2013* -
## chemistry

When 7.50 grams of iodine (I2) is added to 48.7 grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is a) 13.3 % b) 15.6 % c) 60.7 % d) 2.96 % e) 86.0%

*asked by jimmy on February 3, 2012*

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