a density of 1.0 M solution of NaCL
29,733 results, page 80

chemistry
an old tablet of vitamin c weighed 1.022 g. It was dissolved in 500 mL water, and a 25.0 mL aliquot of this solution required 22.6 mL of .005 M I2 solution to oxidize it. Calculate the mg vitamin C in the tablet. 
Food Chemistry
A new food colorant has a molar absorptivity of 3.8x 10^3 cm^1M^1 at 510 nm: (1) what will be the absorbance of a 2X10^4 M solution in a 1 cm cuvette determined at 510 nm; (2) what will be the percent transmittance (T%) of the solution in (1) in this case 
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.) 
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.) 
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.) 
Analytical Chemistry
I have a 0.00156 M solution of CuSO4*5H2O in water (from 0.0398 g of CuSO4*5H20 in 100 mL of water). How would I calculate the ppm of Cu of that solution from that information? 
Chemisty
You have 775 mL of an 0.11 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.05? (The pKa of acetic acid is 4.76.) I don't know what to do!!! HELP!!!! 
Chemistry
You prepare a buffer solution by dissolving 2.00 g each of benzoic acid, C6H5COOH and sodium benzoate, NaC6H5COO in 750.0 mL of water. What is the pH of this buffer? Assume that the solution's volume is 750.0 mL. 
chemistry
75.0 mL of a 1.50 M solution is diluted to a total volume of 278 mL. A 139mL portion of that solution is diluted by adding 139 mL of water. What is the final concentration? Assume the volumes are additive. 
Algebra
A chemical manufacturer wishes to fill an order for 700 gallons of a 24% acid solution. Solutions of 20% and 30% are in stock. How many gallons of 20% acid solution will be used in the desired mixture? 
Algebra 1
Which cannot describe a system of linear equations? a) no solution b) exactly two solutions c) infinite solutions**** d) exactly one solution To be honest I think the answer is C. Please Help! 
math help :)
the lab keeps two acid solutions on hand. one is 20% and the other is 35%. how much 20% and how much 35% acid solution should be used to prepare 25 liters of a 26% solution? 
Chemistry
You wish to prepare 0.18 M HNO3 from a stock solution of nitric acid that is 18.9 M. How many milliliters of the stock solution do you require to make up 1.00 L of 0.18 M HNO3? Answer and..... HOW DO I DO IT? 
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! 
chemistry, organic chemistry
How do we calculate the temperature of a mixture of hexane and heptane at which the mixture solution equals 1atm?This will be the boiling point of the solution 
MATH
Pewee adds two liters of pure alcohol to a 30% solution of alcohol in water. If the new concentration is 40%, how many liters of the original solution were there? 
Chemistry
Calculate ΔG at 298 K for the electrochemical cell consisting of Au metal in a 0.00500 M Au(NO3)3 solution and Cu metal in a 0.950 M Cu(NO3)2 solution. 
algebra
If a system has an infinite number of solutions, use setbuilder notation to write the solution set. If a system has no solution, state this. m  2n = 16, 4m + 4 = 1 
chemistry
you must prepare 300 mL of .750M NaBr solution using 2M NaBr stock solustion. how many mL of stock solution should you use? 
chemistry
The osmotic pressure of a solution containing 5.00 mg of an unknown protein per 10 mL of solution was 2.73 torr at 25 °C. Find the molar mass of the unknown protein. 
Chemistry
A solution of HCL whose pH=2.010 was added to neautralize a 40.00 ml solution of KOH, the molarity of KOH is .2567 M. How many mls of HCl were required? 
chemistry
Benzoic Acid (HC6H5OO, 122.0 g/mol) has a Ka = 6.3 x 105. What is the pH of a solution that has 3.050 g of benzoic acid in enough water to make a 0.250 L solution? 
Chemistry
Suppose that 50.0mL of 0.240M sulfric acid requires 36.0mL of KOH solution to reach its endpoint. What is the molarity of the KOH solution? 
Geometry
ABCD is a parallelogram with angle B= 120, angle C= 60, angle D= 2x+5y, and angle A= 4x+y. Find the values of x and y. Check your solution, only an algebraic solution will be accepted. 
chemistry
a 35.5 mL sample of an NaOH solution is needed to titrate a 2.08 g sample of pure benzoic acid (HC7H5O2)a solid. What is the molarity of the NaOH solution? 
chemistry
If 35.7{\rm mL} of 0.205{\rm M} {\rm KOH} is required to completely neutralize 20.0{\rm mL} of a {\rm HC_2H_3O_2} solution, what is the molarity of the acetic acid solution? {\rm HC_2H_3O_2}(aq) + {\rm KOH}(aq) \to {\rm KC_2H_3O_2}(aq) + {\rm H}_{2}{\rm O}(l) 
Math
If the pH of a solution increases by 4 (from 4 to 8), how much does the hydrogen ion concentration change? Does the change make the solution more acidic or more basic? 
chemistry
calculate the number of milliliters of 0.10 M cupric sulfate solution that must be diluted to prepare 10mL of a 0.015M cupric sulfate solution. 
AP Chemistry
A solution of AgI contains 1.2 mol/L Ag+. Ksp of AgI is 8.3×10^17. What is the maximum I− concentration that can exist in this solution? Answer in units of mol/L 
ap chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 680 mL of solution. What is the pH of this buffer? Ka = 2.4×10−6 for HA. 
chemistry
Based on your titration of the 150ppm standard solution of Ca2+ calculate the molarity of the EDTA solution we used, which is Ca2+ + EDTA4 > [CA(EDTA)]2 
algebra
solve the equation. Enter the answer as a commaseparated list. if there is no real solution, enter no real solution. x upper 2  10x+20=0 
chemistry
estimate the mass of BaSO4 that will be produced when a 100ml of a 2M solution of Ba(NO3)2 in water is added toa 100ml of a 2M solution of NaSO4 in water 
analytical chemistry
A solution containing 0.40 M B (a weak base) and 0.20 M BH+ (the salt of the weak base) has a pH = 10.30. What is the pH after 25 mmol of HCl is added to 250 mL of this solution? 
Chemistry
100g of a saturated solution of KNO3 was cooled from 80 degrees to 50 degrees. What mass of KNO3 would be expected to crystallise out of the solution? 
chemistry
if 5.105 gm of KHP (Mwt=204.2)was dissolved in 250 ml,10.70 ml of this solution of KHP was titrated with 10.0 ml of NaOH . Calculate the concentration of NaOH solution 
DON VASCO PATNA
A salt solution of 15 litres contains 20% salt.How much water must you add to salt solution in order to dilute it 15% salt? 
chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.13 moles of KOH into 760 mL of solution. What is the pH of this buffer? Ka = 3.3 × 10−6 for HA. 
Chemistry help
1. Find the pH when there are 0.034 moles of h+ in a liter of solution 2. Find the pH when there are 1.6x10^7 moles of h+ in 500 ml of solution Please help me on these only problems im struggling with, thank you! 
Chemistry
A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 102 (Ka1) and 5.37 × 107 (Ka2). What is the pH of the solution ? 
CHEMISTRY !!! HELP !
A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 102 (Ka1) and 5.37 × 107 (Ka2). What is the pH of the solution ? 
Chemistry
calculate the % dissociation of a 0.750M acetic acid solution and 0.50 M sodium acetate solution. I got the % for acetic acid to be 0.48% but cant finish the question. 
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 
Chemistry
A saturated solution of NH4Cl was made using 500g of water at 90 degrees. the solution was cooled to 50 degrees. what mass of NH4Cl was crystallized 
chemsitry
Consider the diprotic acid H2A with K1 1*10^3 and K2= 1*10^9 . Find pH, [H2A], [HA], and [A2] for a .2000M solution of H2A b)Find pH, [H2A], [HA], and [A2] for a .200M solution of HA c) Find pH, [H2A], [HA], and [A2] for a .200M solution of A 
Astronomy
Which of the below statements about the CMB are true? (i) The “hot” and “cold” spots are areas where photons have slightly more or less energy than average. (ii) It shows that the Universe was accelerating at the time the CMB formed, thus measuring dark energy early in... 
Chemistry
The boiling point of a solution increases directly as a function of the number of moles of solute present in a given mass of solution. This relationship is expressed mathematically by the following equation. ΔTb = Kb·m ΔTb is the boilingpoint elevation of a solution, m is ... 
Chemistry
In lab we did thermochemistry, where we are supposed to find the heats of solution, heat change of calorimeter and molar heat solution of the salt. I calculated that the calorimeter constant for the water we had was 883.194 Joules. We took 1/10 of a mole of NH4Cl and tried to ... 
Chem
A bottle of win contains 12.5% ethanol by volume. The density of ethanol (C2H5OH) is .79 g/mL. Calculate the concentration of ethanol in wine as mass percent and molality. I calculated molality as 2.4 m/kg, but I'm stumped on the mass percent [although I'm hitting the right ... 
Chemistry
80.0 grams of KBr is mixed with sufficient water to prepare 1865 mL of solution. This solution is then mixed with 46.3 mL of 0.425 M KCl solution. 12 mL of this mixture is subsequently added to 61.0 mL of distilled water. Calculate the molarity of K+ ions in the final mixture... 
math
An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid? 
Chemistry
A 200 mg/dl solution was diluted 1:10. This diluted solution was then additionally diluted 1:5. What us the concentration of the final dilution? 
chemistry
To what volume should you dilute 30 mL H2SO4 of a 10.0 M H2SO4 solution to obtain a 0.140 M H2SO4 solution? 
chemistry
To what volume should you dilute 30 mL H2SO4 of a 10.0 M H2SO4 solution to obtain a 0.140 M H2SO4 solution? 
algebra
How many kilograms of pure alcohol must be added to 40 kg of a 70% alcohol solution to produce an 85% alcohol solution? 
algebra
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt? 
algebra
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt? 
chem
a solution is prepared with 3.26g kcl and water to make 25.0ml,of kcl,what is the %(m/V) of the kcl solution. 
Chemistry multiple choice
During today’s experiment we will produce hydrogen gas (H2) using zinc metal (Zn(s)) and hydrochloric acid (HCl). Which is a balanced net ionic equation illustrating this process? A. Zn (s) + 2 HCl (aq) > Zn2+ (aq) + H2 (g) + 2 Cl (aq) B. Zn (s) + 2 H+ (aq) > Zn2... 
Chemistry
An element has bcc packing with a bodycentered cubic unit cell. Its density is 19300 kg/m3 and the unit cell volume is 3.17 x 1026 L. Calculate the molar mass (g/mol) of the element to three significant figures. The element rubidium has bcc packing with a bodycentered cubic... 
chemistry
A student placed 10.5 g of glucose C6H12O6 in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform... 
Chemistry
For this question, I know how to answer the first three questions, but not the rest. 12ml 0.025 M of benzoic acid (Ka=6.3x105)is titrated with 0.050 M NaOH. How many moles of benzoic acid are there? I got 0.0003 What volume of NaOH is required?(L) I got 0.006 What is the ... 
chemistry
A 1.0 M acetic acid solution (CH3COOH, pKa = 4.7) is neutralized by dissolving NaOH(s) (a strong base) in the solution. Estimate the pH at the equivalence point of the neutralization process: 4.7 7.0 9.3 Which one of the following statements best explains your prediction? 1. ... 
Chemistry
If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this reaction? 2.) what is the ... 
Chemistry
A 0.750 g sample of an unknown solid is dissolved in 100 mL of water and acidfied with 25 mL of 3 M H2SO4 then titrated with a 0.0200 M KMnO4 solution. If the unknown solid requires 12.5 mL of the KMnO4 solution to reach the endpoint, what is the % sodium oxalate in the ... 
Physical science
Hello! 1.How can the density of a hollow lead ball filled with water be increased? a.Increase the size of the ball and add more water.* b.Remove the water and replace it with air. c.Remove the water and melt the ball into a solid sphere. d.Remove the water and replace it with ... 
Biology
6. Consider an experiment in which starch is dissolved in a liter of water. Some of the solution is placed into a securely tied dialysis bag. The dialysis bag is placed into a beaker containing distilled water and iodine for 30 minutes. What are the correct answers for the ... 
Organic Chemistry
The solubility of compound A in ethanol is 0.5 g per 100 mL at 0oC and 5.0 g per 100 mL at 78oC. (a) To make a hot, saturated solution of 15.0 g of A at 78oC, how much ethanol is required? (b) When the solution prepared in is cooled to 0oC, how much of compound A will be ... 
science
A student prepared a .10M solution of acidic acid. Acidic acid has a Ka of 1.75 x 103. What are the hydronium ion concentration and the PH of the solution? I think the PH is 1.76 because I hit log(1.75 x 103) on my calculator and that's what I got thanks in advance for your... 
science
Is a gelatin dessert a solution, a suspension or a colloid? I think it is a suspension. Thanks you. The ingredients of gelatin are completely soluble in water and the end product is clear and transparent. It is a solution, in my opinion. 
Chem II
A 0.10 M HF solution is 8.4% ionized. Calculate the H^+ ion concentration. Here is my line of thought. For every mole HF disolved yeilds one mole of H^+. Since there is ).10 M HF, and the solution is 8.4% ionized = 0.84 M. Is this correct? 
Chemistry
You have a 12 M solution of hydrochloric acid. How many milliliters of this solution will give 25.0 mL of 2.0 M hydrochloric acid when diluted? Where to start, and Where to end. The process of figuring this problem would be greatly appreciated. 
organic chemistry
A solution of acetic acid (CH3COOH; Ka = 1.74 x 105) was titrated to a final pH of 4.76 by using NaOH solution. What % of acetic acid is converted to sodium acetate (CH3COONa+)? Show your method 
chemistry
Calculate the solubility (in grams per 100 mL of solution) of magnesium hydroxide in a solution buffered at pH = 12. I can get the answer in grams per mole, but i am having difficulty changing it to g/100ml. 
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 
Chemistry
Given a solution of ammonium chloride. What additional reagent or reagents are added to prepare a buffer from the ammonium chloride solution? I know the answer is NaOH but I don't know why. Can someone explain this to me please? 
Chem
a blue solution of copper(II) sulfate is mixed with a colerless solution of sodium phosphate and a blue percipitate is formed. Using solubility rules predict the formula of the percipitate 
chemistry
Determine the of mole of water molecules in one mole of a sample of an iron containing (nh4)2so4. FeSO4. nH2O. titrate a solution of the iron containg (solution Y) 
Chemistry
An aqueous solution that 2.10 M in AgNO3 is slowly added from a buret to an aqueous solution that is 1.20×10^−2 M in Cl and 0.260 M in I . When the second ion begins to precipitate, what is the remaining concentration of the first ion? 
Chemistry
An aqueous solution of HCl has a high electrical conductivity when compared to the compound in hexane, whilst the conductivity of a solution of the compound in diethyl ether has an intermediate value. Explain. 
science
When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium acetate solution in order to bring its pH to the target value of 5.00. 
chemistry
1.00 of an aqueous solution contains 1.52g of a compound used in antifreeze. If the osmotic pressure of this solution at 20.0 degree C is 448 torr, calculate the molar mass of the antifreeze compound 
Chemistry
how would you do this question when i did it i did log(1.0) but that is just 0 so what it the procedure to do this question Calculate the pH of a 1.0 mol/L aqueous solution of sodium benzoate. Note: Only the benzoate ion affects the pH of the solution. 
Chemistyr
A 55.29g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many milliliters of this solution must be diluted with water in order to make 1.00 L of 0.100 M Ba(OH)2? (Ignore significant figures for this problem.) 
Chemistry
A 55.29g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many milliliters of this solution must be diluted with water in order to make 1.00 L of 0.100 M Ba(OH)2? (Ignore significant figures for this problem.) 
chemistry
2. A solution of I2 was standardized with ascorbic acid. Using a 0.1000g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. a) What is the molarity of the iodine solution? 
Utlwanang Barolong secondary school
physical science it is found that 40 ml of a 0.5mol.dm^3 sodium hydroxide solution is needed to neutralise 20mol of the vinegar. calculate the pH of the sodium hydroxide solution 
Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)>2 NaNO3(aq)+CO2(g)+H20(l) 
Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)>2 NaNO3(aq)+CO2(g)+H20(l) 
Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)>2 NaNO3(aq)+CO2(g)+H20(l) 
Algebra 2
What are the real and complex solutions of the polynomial equation? 27x^3 + 125 = 0 I already got the real solution x = 5/3, I just need to figure out how to find the complex solution. Any help? 
Chemistry,please help
You are working with the following equilibrium system in which one chromium complex is blue and one chromium complex is purple. The system is at equilibrium and is currently blue. Predict how the color will change if aqueous Ag+ ions are added. Ag+ reacts with NH3 to form a ... 
Chemistry
Rearrange the titration calculation to find Mb in a solution. If I put 13.2 mL of NaOH and 0.3 mL of phenolphthalein in 25 mL of KHP, what is the Mb of the solution? The original solution of NaOh is 100 mL and is composed of 1.069e15 moles of H+, 9.445e2 moles of OH, and 9.... 
science
Calculate the final concentrations in mol/L of H+, Na+, Cl and SO42 when the following three solutions are mixed together: 1000 cm3 of 0.10 mol dm3 HCl 500 cm3 of 0.20 mol dm3 NaCl 500 cm3 of 0.20 mol dm3 of Na2SO4 
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.e002M) potassium dihydrogen phosphate, KH2PO4. Note the ... 
Homework Help: Solar Energy Please HelpASAP
d) In the upconvertor 1, two photons are converted into one photon with 100% conversion efficiency. If all photons with energy above that of the band gap of aSiC:H are absorbed in the aSiC:H layer, in which spectral range can the photons be upconverted so that they ... 
General Chemistry
Starting out with 50 mL of 0.20 M NaHCO3, calculate how many mL of 0.50 M NaOH solution to add to make 100 mL of approximately 0.10 M (total) buffer solution with a pH of 10.35. By adding NaOH, some of the NaHCO3 gets converted to the conjugate Na2CO3. This conjugate acid/base... 
Chemistry
You wish to prepare 0.18 M HNO3 from a stock solution of nitric acid that is 18.9 M. How many milliliters of the stock solution do you require to make up 1.00 L of 0.18 M HNO3? 
Chemistry
How many moles of HNO3 are required to make 250mL of a 2.4M solution? How many grams of KOH are required to make 125mL of a .50M solution? 
Chemistry
Calculate the cell potential for the electrochemical cell consisting of Ag metal in a 0.500 M AgNO3 solution and Fe metal in a 3.0 M Fe(NO3)3 solution.