28 Answered Questions for the topic Concentration

#### 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...
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#### 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

#### 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...
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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...
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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...
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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?

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....
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#### 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...
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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...
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#### 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...
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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

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...
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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

#### 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?

#### 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?

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

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.

#### 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...
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#### 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?

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...
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#### 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?

08/17/16

#### Concentration with Uncertainty

Timothy has 1 gallon of 6% bleach, assume 94% is water.Timothy decides to dilute the bleach separately. Timothypours 10mL+0.1, 9mL+0.1, 8mL+0.1, 7mL+0.1, 6mL+0.1, and 1mL+0.1, of the bleach into 6...
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#### how do you make a 10ml solution with a .40m concentration

I know it has to do with molars and making a solution that we can measure how much light goes through it because we are doing concentration.

Concentration

06/28/15

#### What is the new concentration when 78.2 mL of a 15.0 M solution of HBr was diluted to 988 mL?

0.908 is the answer. Just need a how to do it. Thanks!

#### Finding concentration!

Please help if you're able. I really don't understand this at all.
A student has a flask containing nitric acid (HNO3 (aq)). She is not sure what the concentration of this acidic solution is...
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