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Rainbow [258]
3 years ago
12

Which will provide the most direct measure of pH by measuring the hydrogen ion concentration of a solution?

Chemistry
2 answers:
pochemuha3 years ago
6 0

Answer : The correct option is, pH meter

Explanation :

pH meter : It is a type of instrument which measures the activity of hydrogen ion in water based solution. Or we can say that it will provide the most direct measure of pH by measuring the hydrogen ion concentration of a solution.

Litmus paper : It is a type of paper which changes the color based on whether the solution is an acid or a base.

Phenolphthalein : It is an indicator which changes the color based on pH values.

Bromthymol blue : It does not tell the concentrations, it is a pH indicator for the weak acids and bases.

Hence, the pH meter provide the most direct measure of pH by measuring the hydrogen ion concentration of a solution.

pogonyaev3 years ago
5 0
PH meter is dircet so the answer is C

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How many CaF are in a 1.7x10^25 please I need help fast!!
Gemiola [76]
<h3>Answer:</h3>

28 mol CaF

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

[Given] 1.7 × 10²⁵ molecules CaF

[Solve] moles CaF

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

  1. [DA] Set up:                                                                                                          \displaystyle 1.7 \cdot 10^{25} \ molecules \ CaF(\frac{1 \ mol \ CaF}{6.022 \cdot 10^{23} \ molecules \ CaF})
  2. [DA] Multiply/Divide [Cancel out units]:                                                         \displaystyle 28.2298 \ moles \ CaF

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs.</em>

28.2298 mol CaF ≈ 28 mol CaF

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3 years ago
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