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zloy xaker [14]
3 years ago
14

En relación a la escala de ph se puede decir lo siguiente: I. Mientras más cerca del 8 la sustancia es más básica II. El papel t

ornasol es un papel indicador, que al generar color azul predice que la sustancia es ácida. III. El agua marina es un ejemplo de sustancia básica
Chemistry
1 answer:
yawa3891 [41]3 years ago
3 0

Answer:

Las sustancias son mas basicas a medida que su ph se acerca a 7 y lo supera.(esto quiere decir que la afirmacion de la pregunta no es la correcta)

En cuanto al papel tornasol, tambien es falsa esa afirmacion ya que este cambia de color rojo-fuxia a azul cuando la sustancia quimica pasa de acida a basica, por ende cuando se alcanza ph de 7 para arriba.

El agua marina es un ejemplo de sustancia ALCALINA, su gran contenido sal-mineral hace que sea sumamente alcalina, superando altamente el ph7, es decir lo contrario al jugo de limon por ejemplo que es acido y ronda en un ph 3,5.

Explanation:

Las sustancias acidas son aquellas que tienen un valor de ph de 0 a 7, a medida que estas acerquen su valor de ph a 7 menos acidez tienen.

En cuanto a las basicas o neutras sus ph rondan en los 7, una vez superado ampliamente este valor como por ejemplo ph10 se considerara que la solucion es alcalina.

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Describe a method to investigate how the temperature changes when different masses of ammonium
rewona [7]

Answer:

Decrease temperature with increase in ammonium nitrate concentration.

Explanation:

The temperature changes when different masses of ammonium nitrate are dissolved in water because the ammonium nitrate takes energy from the surrounding water environment for the breaking of ionic bonds as a result the temperature of water decreases. When more concentration of ammonium nitrate is added to water, more decrease occur in temperature of water and the water becomes cold.

4 0
2 years ago
What would be the voltage (Ecell) of a voltaic cell comprised of Cr (s)/Cr3+(aq) and Fe (s)/Fe2+(aq) if the concentrations of th
zaharov [31]

Answer:

0.35 V

Explanation:

(a) Standard reduction potentials

                            <u> E°/V</u>

Fe²⁺ + 2e- ⇌ Fe; -0.41

Cr³⁺ + 3e⁻ ⇌ Cr; -0.74

(b) Standard cell potential

                                             <u>  E°/V</u>

2Cr³⁺ + 6e⁻ ⇌ 2Cr;               +0.74

<u>3Fe  ⇌ 3Fe²⁺ + 6e-;             </u>  <u>-0.41 </u>

2Cr³⁺ + 3Fe ⇌ 2Cr + 3Fe²⁺; +0.33

3. Cell potential

2Cr³⁺(0.75 mol·L⁻¹) + 6e⁻ ⇌ 2Cr

<u>3Fe  ⇌ 3Fe²⁺(0.25 mol·L⁻¹) + 6e- </u>

2Cr³⁺(0.75 mol·L⁻¹) + 3Fe ⇌ 2Cr + 3Fe²⁺(0.25 mol·L⁻¹)

The concentrations are not 1 mol·L⁻¹, so we must use the Nernst equation

E = E^{\circ} - \dfrac{RT}{zF}\ln Q

(a) Data

  E° = 0.33 V

   R = 8.314 J·K⁻¹mol⁻¹

   T = 298 K

   z = 6

   F = 96 485 C/mol

(b) Calculations:  

Q = \dfrac{\text{[Fe}^{2+}]^{3}}{ \text{[Cr}^{3+}]^{2}} = \dfrac{0.25^{3}}{ 0.75^{2}} =\dfrac{0.0156}{0.562} = 0.0278\\\\E = 0.33 - \left (\dfrac{8.314 \times 298}{6 \times 96485}\right ) \ln(0.0278)\\\\=0.33 -0.00428 \times (-3.58) = 0.33 + 0.0153 = \textbf{0.35 V}\\\text{The cell potential is }\large\boxed{\textbf{0.35 V}}

 

7 0
3 years ago
How many significant figures are there in this expression 0.001050
WITCHER [35]
4 sig fig in that expression
4 0
2 years ago
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Convert 1.422g/cm^2 to mg/mm^2
Natalija [7]
The answer is 14.22 mg / (mm^2)
6 0
3 years ago
Compare the change in pH with the addition of acid and base to deionized water and to a buffer.
iogann1982 [59]

Answer:

case1.

The addition of acid and base leads to a change in pH of the water when adding to deionized water due to fact that acid and bases dissociated in dissolving in water. If the H+ ion increases in the water as acid addition hikes it, it will result in decreasing the pH value. The intensity of the acid also affects the dissociation of the ions.

case2

Buffers are normally formed by weak acid and its conjugate base, and adding acid to the buffer it absorbs the H+ ions so the pH will be lower and adding base or increase of OH- conjugate base resists the pH value to increase.

5 0
2 years ago
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