---
title: When an acid meets an alkali, they react and cancel each other out:… — Alkalis and soda, and how they cancel acids · tree and pragmatics
description: When an acid meets an alkali, they react and cancel each other out: this is called neutralisation. Who acts: acid, they. A sentence of the lesson «Alkalis and soda, and how they cancel acids» of the chemistry course of Mova's primary school with its dependency tree and the pragmatics of every clause
---

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# Alkalis and soda, and how they cancel acids, sentence 2

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When an acid meets an alkali, they react and cancel each other out: this is called neutralisation.

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**Who acts:** acid, they · **What happens:** meet, react, cancel out, call · **To what, where:** alkali, each, this · **Speech:** someone speaks here

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This is a sentence of the lesson «Alkalis and soda, and how they cancel acids» of the chemistry course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (acid, they), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:016-alkalis-and-soda.lesson:2
# text = When an acid meets an alkali, they react and cancel each other out: this is called neutralisation.
# source = school lesson (ours)
# course = chemistry
# lesson = 016-alkalis-and-soda.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change
1	When	when	SCONJ	WRB	_	4	mark	_	_
2	an	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
3	acid	acid	NOUN	NN	Number=Sing	4	nsubj	_	_
4	meets	meet	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	advcl	_	_
5	an	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	alkali	alkali	NOUN	NN	Number=Sing	4	obj	_	_
7	,	,	PUNCT	,	_	9	punct	_	_
8	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	9	nsubj	_	_
9	react	react	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
10	and	and	CCONJ	CC	_	11	cc	_	_
11	cancel	cancel	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	9	conj	_	_
12	each	each	DET	DT	ExtPos=PRON|PronType=Rcp	11	obj	_	_
13	other	other	ADJ	JJ	Degree=Pos	12	fixed	_	_
14	out	out	ADP	RP	_	11	compound:prt	_	_
15	:	:	PUNCT	:	_	18	punct	_	_
16	this	this	PRON	DT	Number=Sing|PronType=Dem	18	nsubj:pass	_	_
17	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	18	aux:pass	_	_
18	called	call	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	9	parataxis	_	_
19	neutralisation	neutralisation	NOUN	NN	Number=Sing	18	xcomp	_	_
20	.	.	PUNCT	.	_	9	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **meet** | present | a acid | a alkali |  |  |  |  | vn meet-36.3-1 «NP V NP»: agent=Agent alkali=Co-Agent |
| 2 | **react** | present | they |  |  |  |  |  | vn respond-113 «NP V»: agent=Agent |
| 3 | **cancel out** | present | they *not said here* | each |  |  |  |  | tree rules |
| 4 | **call** | present · passive |  | this |  |  |  |  | vn initiate\_communication-37.4.2-1 «NP V NP.recipient»: subject=Recipient |

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One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:chemistry:016-alkalis-and-soda.lesson:2`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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