The titration of an acid (H2A) with LiOH solution generates the following titration curve. What are the main components (more than half of the initial amount of H2A, besides H2O) at equivalence point 1 (EP1) and equivalence point 2 (EP2)? Main Components at EP1 Main Components at EP2
A H2A and OH− A2− and OH−
B HA− and Li+ A2− and Li+
C HA− and OH− HA− and Li+
D H2A and Li+ HA− and OH−

Answers

Answer 1

Answer:

The main components (more than half of the initial amount of H2A, besides H2O) at equivalence point 1 and 2 (EP1), (EP2) is HA⁻ and Li⁺ A²⁻ and Li⁺.

What is the Titration curve?

Titration of acid H₂A with LiOH solution.

At first equivalent points are:

H₂A + LiOH → HA⁻ + Li⁺ + H₂O

The Main component at (EP1) => HA⁻ and Li⁺

At second equivalence point are:

HA⁻ + LiOH → A²⁻ + Li⁺ + H₂O

Main component at (EP2) => A²⁻ and Li⁺

Therefore, the correct option is B which is HA− and Li+ A2− and Li+

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Answer 2

Answer:

Answer:

B) HA⁻ and Li⁺ A²⁻ and Li⁺

Explanation:

Titration of acid H₂A with LiOH solution.

At first equivalent point

H₂A + LiOH → HA⁻ + Li⁺ + H₂O

Main component at (EP1) => HA⁻ and Li⁺

At second equivalence point

HA⁻ + LiOH → A²⁻ + Li⁺ + H₂O

Main component at (EP2) => A²⁻ and Li⁺

Therefore, the correct answer is B

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Predict whether the compounds are soluble or insoluble in water

Answers

Answer:

The polar compounds are soluble in water while non polar are insoluble in water.

Explanation:

Solvent is the that part of solution which is present in large proportion and have ability to dissolve the solute. In simplest form it is something in which other substance get dissolve. The most widely used solvent is water, other examples are toluene, acetone, ethanol, chloroform etc.

Water is called universal solvent because of high polarity all polar substance are dissolve in it. Hydrogen is less electronegative while oxygen is more electronegative and because of difference in electronegativity hydrogen carry the partial positive charge while oxygen carry partial negative charge.

Water create electrostatic interaction with other polar molecules. The negative end of water attract the positive end of polar molecules and positive end of water attract negative end of polar substance and in this way polar substance get dissolve in it.

Example:

when we stir the sodium chloride into water the cation Na⁺ ions are surrounded by the negative end of water i.e oxygen and anion Cl⁻ is surrounded by the positive end of water i.e hydrogen and in this way all salt is get dissolved.

The chemicals that can dissolve in a certain solvent to create a homogenous mixture known as a solution are said to be soluble chemicals. The compounds that are soluble are: $KNO_3$ , $AgNO_3$ , and $CuBr_2$ .

As per this,

Nitrate ( $NO^{3-$ ) salts are often soluble in water. $KNO_3$ is potassium nitrate.
The majority of nitrate ( $NO^{3-$ ) salts, including silvernitrate, are soluble in water, including $AgNO_3$ .
The majority of bromide ( $Br^-$ ) salts, including copper(II) bromide, are water soluble.

Insoluble:

Lead(II) chloride, or $PbCl_2$ , is an exception and is regarded as being insoluble in water among the chloride ( $Cl^-$ ) salts.
Barium sulphate, also known as BaSO4, is an exception to the rule of most sulphate ( $SO^{4-$ ) compounds being soluble in water.

Thus, these are the classification of the compounds as per their solubility.

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Your question seems incomplete, the prpbable complete question is:

Predict whether the following compounds are soluble or insoluble in water. Soluble Insoluble PbCl2, BaSO4, KNO3, AgNO3, and CuBr2.

What have you observed when you fill in a basin with water? how do you do it?

Answers

When you fill a basin with liquid water, you can see that the water takes the shape of the container in which it is contained. This is because in the liquid state, water has molecules farther apart than in the solid state.

You can notice this property when performing an experiment with liquid and solid water.

When filling a glass, liquid water takes on the shape of a glass, and solid water, such as an ice cube, remains the same shape when placed in a glass.

Therefore, when filling a basin with water we perceive a property of the physicalstate of water, in liquid form. Water is one of the few substances that can be found naturally in liquid, solid and gaseous states.

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Answer:

Cautiously and avoiding filling in the central area so that it does not overflow when filling, since being very beach makes filling difficult.

Explanation:

The basins are shallow, that is why filling is difficult, the filling must be slow, low intensity and at the edges not placing the water filling in the center of the basin.

2. Which test for iron(II) ions is conclusive

Answers

The conclusive test for iron(II) ions is the test by the use of potassium hexacyanoferrate III solution.

In qualitative analysis certain reagents are used to test for the presence of certain cations or anions. Those reagents react in a certain way with those reagents. Usually, a positive test may involve a color change, formation of a precipitate or evolution of a gas.

In the case of iron(II) ions, potassium hexacyanoferrate III solution is used in the conclusive qualitative test for the ion. A positive test involves the appearance of a deep blue precipitate.

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Answer:

please brainlist answer

Explanation:

The addition of K 3 Fe(CN) 6 to a solution causes the formation of a deep blue precipitate which indicates that iron(II) ions are present.

The quantity of mass of an object contained within its volume is a measure of

Answers

the answer is density

the quantity of mass of an object contained within its volume is a measure of density

The federal limit for cadmium in drinking water is 0.010 mg per liter of solution. What is the molar concentration of a Cd solution that has reached the limit?

Answers

Thank you for posting your question here. The molar concentration of a Cd solution that has reached the limit is 8.89x10^-8 mols/L. The equation to be used M=n/L to solve the above problem. Below is the solution:

.010mg/L = .00001g/L
.00001g / 112.41g/mol = 8.89x10^-8 mols/L

Answer:

$M=8.9x10^(-8)M$

Explanation:

Hello,

In this case, one can assume 1L as the volume of the solution, so we've got 0.010mg of cadmium. Now, as we're asked to know its molarity, one computes the moles of cadmium as follows:

$n_(Cd)=0.010mg*(1x10^(-3)gCd)/(1mgCd)*(1molCd)/(112.4gCd)=8.9x10^(-8)molCd$

Now, one obtains the molar concentration (molarity) as shown below: $M=(8.9x10^(-8)molCd)/(1L)\n M=8.9x10^(-8)M$

Best regards.

A balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth? a. 0.154 L b. 6.50 L c. 0.615 L d. 1.63 L d. None of the above