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3 years ago

What would be the observation when pineapple juice is dipped in a red litmus paper

Chemistry

2 answers:

Elena L [17]3 years ago

7 0

Answer:

Red to blue as it has boelomin which is acidic but alkalanic(basic)in nature.

Explanation:

Pineapple contains bromelain. This naturally occurring substance is most concentrated in fresh pineapple.

Bromelain has anti-inflammatory and anticancer properties. Although it’s acidic, some experts believe that it has an alkalizing effect as you digest it. This may be beneficial to people with acid reflux. People believe the bromelain enzyme reduces swelling, bruising, and other injury-related pains.

Sloan [31]3 years ago

6 0

Answer:

red litmus paper change into blue when it is dipped into Pineapple juice.

hope it helps

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Numero de oxidacion Fe + O2=Fe2O3

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Fe =0

O2 =0

Fe in Fe2O3 =+3

O in Fe2O3=-2

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3 years ago

Two gas samples have the same number of molecules, the same volume, and the same pressure. Which of the following could be true?

OverLord2011 [107]

The choices are:
A. The first gas sample has a temperature of 273 K, and the second gas sample has a temperature of 0°C.
B. The first gas sample has a temperature of 273 K, and the second gas sample has a temperature of 298 K.
C. The first gas sample has a temperature of 273 K, and the second gas sample has a temperature of 273° C.
D. The first gas sample has a temperature of 273 K, and the second gas sample has a temperature of 100° C.

The correct answer is A because the two gases will have the same temperature and 273 K = 0°C

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3 years ago

A chemist titrates of a hypochlorous acid solution with solution at . Calculate the pH at equivalence. The of hypochlorous acid

const2013 [10]

The question is incomplete, here is the complete question:

A chemist titrates 110.0 mL of a 0.2412 M hypochlorous acid (HCIO) solution with 0.0613 M NaOH solution at 25°C. Calculate the pH at equivalence. The pKa of hypochlorous acid is 7.50. Round your answer to 2 decimal places

Answer: The pH of the solution is 10.09

Explanation:

To calculate the volume of base, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $HClO$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=1\\M_1=0.2412M\\V_1=110.0mL\\n_2=1\\M_2=0.0613M\\V_2=?mL$

Putting values in above equation, we get:

$1\times 0.2412\times 110.0=1\times 0.0613\times V_2\\\\V_2=\frac{1\times 0.2412\times 110.0}{1\times 0.0613}=432.8mL$

At equivalence, the number of moles of acid is equal to the number of moles of base. Also, the moles of salt which is NaClO will also be the same.

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$ .....(1)

For HClO:

Molarity of HClO solution = 0.2412 M

Volume of solution = 110.0 mL

Putting values in equation 1, we get:

$0.2412M=\frac{\text{Moles of HClO}\times 1000}{110}\\\\\text{Moles of HClO}=\frac{(0.2412\times 110)}{1000}=0.026532mol$

For NaClO:

Moles of NaClO = 0.026532 moles

Volume of solution = [432.8 + 110] mL = 542.8 mL

Putting values in above equation, we get:

$\text{Molarity of NaClO}=\frac{0.026532\times 1000}{542.8}=0.0489M$

To calculate the pH of the solution, we use the equation:

$pH=7+\frac{1}{2}[pK_a+\log C]$

where,

$pK_a$ = negative logarithm of weak acid which is hypochlorous acid = 7.50

C = concentration of the salt = 0.0489 M

Putting values in above equation, we get:

$pH=7+\frac{1}{2}[7.50+\log (0.0489)]\\\\pH=7+3.09=10.09$

Hence, the pH of the solution is 10.09

4 0

3 years ago

Calculate the enthalpy change (in joules) involved in converting 5.00 grams of water at 14.0 °c to steam at 115 °c under a const

tensa zangetsu [6.8K]

Enthalpy change is the term given to the concentration of the heat absorbed or evolved in a reaction carried out at a constant pressure. It is given by the symbol ΔH.

Enthalpy change = m (Cwater × dT + Hvap + Csteam × dT

dHvap = 40.67 kJ/mol = 40.67 × 103/18 = 2259.4 J/g

Enthalpy change = 5.00 [4.18 × (100-14) + 2259.4 + 1.84 × (115-100)]

= 13232.4 J

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3 years ago

Need help fast please

fenix001 [56]

Explanation:

When the reaction takes place,2 grams of carbon dioxide will be made but vaporized into air.

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3 years ago

What would be the observation when pineapple juice is dipped in a red litmus paper​

What would be the observation when pineapple juice is dipped in a red litmus paper