Q&A for How to Write a Net Ionic Equation

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How to know the charge on the compound when an acid is dissociated in water such as H3PO4 in different steps?

Meredith Juncker, PhD
Scientific Researcher
Meredith Juncker is a scientific researcher based in Brookline, Massachusetts. Currently working as a Senior Patent Technology Specialist at Dana-Farber Cancer Institute, Meredith is able to leverage her expertise in biochemistry and molecular biology. She received a PhD in Biochemistry and Molecular Biology from Louisiana State University Health Sciences Center, focusing on proteins and neurodegenerative diseases. She went on to work as a Postdoctoral Associate at the Jacobs School of Medicine and Biomedical Sciences at the State University of New York at Buffalo.

Meredith Juncker, PhD

Scientific Researcher

Expert Answer

H3PO4 is a triprotic acid, meaning it can undergo three dissociations and as such will have three dissociation constants (Ka1, Ka2, Ka3). So the charge on H3PO4 will change as each hydrogen ion dissociates in solution.

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Net ionic equation for zinc sulfide and hydrochloric acid

Meredith Juncker, PhD
Scientific Researcher
Meredith Juncker is a scientific researcher based in Brookline, Massachusetts. Currently working as a Senior Patent Technology Specialist at Dana-Farber Cancer Institute, Meredith is able to leverage her expertise in biochemistry and molecular biology. She received a PhD in Biochemistry and Molecular Biology from Louisiana State University Health Sciences Center, focusing on proteins and neurodegenerative diseases. She went on to work as a Postdoctoral Associate at the Jacobs School of Medicine and Biomedical Sciences at the State University of New York at Buffalo.

Meredith Juncker, PhD

Scientific Researcher

Expert Answer

This is a double-displacement reaction with ZnCl2 and H2S as products. ZnS(aq) + 2HCl(aq) --> ZnCl2(aq) + 2H2S(g) The net ionic equation is: 2H+ + S2- --> 2H2S

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Why can't weak acids dissociate?

Community Answer

Weak acids do dissociate but minimally because of their very low solubility. Their solubility is usually written as >50%.

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How do I write a net ionic equation if I'm not told whether it's a solid, liquid, or aqueous solution?

Community Answer

Look at the periodic table and use whatever state it's in there, whether it's solid, liquid, or aqueous.

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3SO2+ Cr2O7(2-)+2H(1+)----3SO4(2-)+2Cr(3+)+H20 Is this a correct ionic equation?

Community Answer

No, sorry. That is a Doric Equation. You can tell by the fluting in the columns.

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How do I figure out how many ions are in a mole?

Community Answer

There are 6.02X10^23 particles of anything in a mole. A mole of atoms is 6.02X10^23 atoms and a mole of molecules is 6.02X10^23 molecules.

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How do I write the product of a chemical equation when I only know the reactants?

Community Answer

it depends if it is a formation, single replacement, double replacement, or combustion.

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What is the simple way to balance net ionic equation?

Community Answer

If you have the entire equation balanced, then just keep the coefficients and it balanced.

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How do I balance an equation with brackets?

Ivy Park

Community Answer

Just think of the formula as the ones that you would see in your math class. When there is a bracket between numbers, you multiply them. Multiply the number in front of the formula and inside the bracket to get the number of that atom/molecule.

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