33 Answered Questions for the topic Concentration

Concentration Chemistry Equilibrium

04/11/22

Equilibrium Chemistry problem
Consider the following equilibrium reaction in a closed gas container with a constant volume: (= is the arrow that goes both ways) H2(g)+I2(g)=2HI(g) At some point, an amount of deuterium gas (D2)... more
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Concentration Science Chemistry Titration

03/19/22

What is the concentration of the NaOH solution?
Suppose you are standardizing a sodium hydroxide solution with KHP (molar mass=204.2 g/mol) according to the equation:KHP+NaOH⟶H2O+NaKPYou prepare the standard solution from 0.299 g of KHP in 250.0... more
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05/22/21

determine the concentration of all aqueous species in the final solution when 455mL of 2.95 M lithium bromide is mixed with 755mL of 3.45M silver nitrate.
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12/19/20

What are some ways that companies are speeding up reactions?
I know that there could increase concentration/pressure and increase the temperature. But the question was asking for examples of ways companies speed up reactions, so I'm guessing real life examples. more
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10/14/20

Standard solution, working out concentration
Hi,So In a practical I used 325mg of a solvent and I dissolved this in water to make it up to 25ml.Now I have to work out the exact concentration of my ''stock'' solution in mg/l is it 0.013... more
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Concentration Science Chemistry

02/24/20

How many grams of NaCl are required to make 500.0 mL of a 0.25 M NaCl standard solution?

A. 7,250 g NaClB. 2.2 g NaCl C. 7.3 g NaCl D. 0.0021
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01/24/19

General Chemistry 2 concentration dilution problem
3. A 4.50 *10^-2 M solution is used to prepare a series of five 100.0 mL solutions of varying concentration for use in creating a calibration curve for a spectrophotometric experiment. Determine... more
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Concentration Chemistry Chemistry Lab

06/13/18

Using mole ratio to determine concentration of a reactant?
S2O82- + 2 I- --> 2 SO42- + I2   (reaction 1)       [I-]=0.20M, [S2O82-]=0.10M      2 S2O32- + I2 --> S4O62- + 2 I-  (reaction 2)      [S2O32-]= 0.0050M   I need to determine the... more
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06/07/18

What is the concentration of each gas once equilibrium is reached?
Can someone please let me know if I did this right?    1.800 mole of N2O4(g) is injected into a closed 1.00L container. Kc=4.66 x 10-3 at 298K   N2O4 (g) ⇌ 2NO2 (g)   what is the... more
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05/30/18

Is the reaction rate dependent on the concentration of the excess reagent?
If a higher concentration means a higher rate of reaction because of more collisions, then does the reaction rate depend on the concentration of the excess reagent? 
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Concentration Total Volume Remains

04/03/18

You place 2.80 g of phosphoric acid (H3PO4) into 150.0ml of a 1.00M sodium hydroxide solution. If the total volume remains constant, determine the following
(Hint: this is an acid base reaction)   1. the concentration of sodium ion at the completion of the reaction____ 2. the concentration of phosphate ion at the completion of the reaction____ 3.... more
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Concentration Chemistry Moles Solutions

03/06/18

Do moles change with volume?
Does increasing or decreasing volume change the moles in a solution, or does that just affect the concentration?   If I have 0.035711 moles in 100mL and I'm asked how many moles in 5mL of this... more
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03/01/18

Relative error to absolute error?
I'm asked to use the relative error to find the absolute error of [Na2S2O3]I've calculated these amounts in previous questions:[Na2S2O3] = 0.01001MRelative error: 0.3%is there other information I... more
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Concentration Chemistry Chem Chemistry Lab

02/25/18

Whats the correct way to approach this concentration question?
Part I. Preparation of a Fe(III)-oxalate complex: (4 pts) a) Recorded mass of Fe(NH4)2(SO4)2●6H2O used: 1.3807 (g) b) pH paper color upon addition of oxalic acid: Magenta c) Does this color... more
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11/29/17

chemistry help
Calculate the emf of the voltaic cell: Concentration of Mg+2 (anode)  is 0.00100 M and Fe+3 (cathode) is 0.100 M   unsure how to find this
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Concentration

11/07/17

Changing Concentration
If 25 ml of creatinine (c4h7n3o) stock standard (conc= 1.0 g/dl) are diluted to 100ml to make an intermediate standard and then 15ml of the intermediate are diluted to 300ml to make a working... more
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Concentration

10/23/17

What will be the value of this concentration expressed in mol∙dm−3?
The concentration of H2SO4 in a certain solution is 1.23×10-2 mol∙cm-3
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Concentration Math Chemistry Physics

10/19/17

Question about Molarity. Please help me, Urgent.
How much water should be added to 10.0 mL of 6.00M HCl to prepare a 0.500M HCL solution?
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Concentration Chemistry Molarity

09/25/17

Concentration of Stock
the concentration of stock solution X is 3.6 x 10^-3 M. The concentration of stock solution Y is .15M. If 4.0 mL of X is mixed with 6.0 mL of Y , what is the new concentrations of X and Y?
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07/10/17

How many moles of NaCl are in 255 g of a 1.24 m NaCl solution?
If you could work me through the steps, that'd be great. Thanks
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Concentration

06/22/17

What formula would I use?
100 gallon tank of coolant is 3percent concentrated.how do i figure out how many gallons of concentrate to add to achieve a concentration level of 8 percent in this 100 gallon tank.
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Concentration Science Biology Chemistry

04/07/17

How much 1M HCl should I add to 100 mL H2O to lower its pH by 1?
It's for a Biology project- I need to have different pH of solutions, with my base point being water with a pH of 7, and then increments down to a pH of 3. I don't know how much HCl to add for each... more
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Concentration Chemistry Water Calcium

02/23/17

Help me with this. My answer is not coming
The values of Ksp of CaCO3 and CaC2O4 are 4.7 × 10–9 and 1.3 × 10–9 respectively at 25°C. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water?
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Concentration Chemistry

11/30/16

Chemistry/ Concentration
A sample of Potassium hydrogen oxalate, KHC2O4, with a mass of 0.832 grams was dissolved in water and titrated with 25.80 mL of a sodium hydroxide solution. Calculate the molarity of the sodium... more
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Concentration Algebra 1 Chemistry Algebra

10/04/16

How many liter of each solution must be mixed?
A chemist has two solutions of HNO3. One has a? 40% concentration and the other has a? 25% concentration.How many liters of each solution must be mixed to obtain 84 liters of a 35?% ?solution?
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