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2 years ago

Is hydrogen peroxide a product

Chemistry

1 answer:

Kazeer [188]2 years ago

7 0

Hydrogen peroxide forms as a product of metabolism. i hope this helps!

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A 25.00 mL sample of 0.320 M KOH is titrated with 0.750 M HBr at 25 °C.

Fudgin [204]

Answer:

a. pH = 13.50

b. pH = 13.15

Explanation:

Hello!

In this case, since the undergoing chemical reaction between KOH and HBr is:

$HBr+KOH\rightarrow KBr+H_2O$

As they are both strong. In such a way, since the initial analyte is the 25.00 mL solution of 0.320-M KOH, we first compute the pOH it has, considering that all the KOH is ionized in potassium and hydroxide ions:

$pOH=-log([OH^-])=-log(0.320)=0.50$

Thus, the pH is:

$pH+pOH=14\\pH=14-pOH=14-0.50\\pH=13.50$

Which is the same answer for a and b as they ask the same.

Moreover, once 5.00 mL of the HBr is added, we need to compute the reacting moles of each substance:

$n_{KOH}=0.02500mL*0.320mol/L=0.00800mol\\\\n_{HBr}=0.005L*0.750mol/L=0.00375mol$

It means that since there are more moles of KOH, we need to compute the remaining moles after those 0.00375 moles of acid consume 0.00375 moles of base because they are in a 1:1 mole ratio:

$n_{KOH}^{remaining}=0.00425mol$

Next, we compute the resulting concentration of hydroxide ions (equal to the concentration of KOH) in the final solution of 30.00 mL (25.00 mL + 5.00 mL):

$[OH^-]=[KOH]=\frac{0.00425mol}{0.03000L}=0.142M$

So the pOH and the pH turn out:

$pOH=-log(0.142)=0.849\\pH+pOH=14\\pH=14-pOH=14-0.849\\pH=13.15$

Best regards!

7 0

3 years ago

Choose the pair in which the first particle has a higher ionization energy than the second particle.

Elena L [17]

A. CI, Br

Explanation:

Different kinds of atoms bind their valence electrons with various amounts of energy. In order to remove the valence electrons, enough energy must be available.

The amount of energy required for the removal of an electron is the ionization energy or ionization potential.

The ionization energy depends on:

Nuclear charge
Atomic radius
Sublevel accomodating the electron to be removed.
Special stability of half or fully filled sublevels.

Across a period, the ionization energy increases.

Down a group ionization energy decreases due to increasing atomic radii.

Cl and Br are in the same periodic group. Cl is element number 2 and Br is element 3 in the group of the halogens.

Therefore, Cl will have a higher ionization energy compared to Br.

Learn more:

Ionization energy brainly.com/question/2153804

#learnwithBrainly

8 0

3 years ago

Which particle has two positive charge and an electron arrangement of 2, 8?

Fynjy0 [20]

The answer is $Mg^{2+}$ . A magnesium atom has 12 protons and an arrangement of [2, 8, 2]. When you lose two electrons, arrangement becomes [2,8] and the atom becomes a positively charged ion